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	A puzzle with a triangle and 57		2012-04-25
		From sharon: Question from sharon, a parent: We have been battling with this for days and cant find any solution - Using each of the following numbers once, fill all the spaces in the triangles so that each side of the triangle adds up to 57 numbers are 11,12,13,14,15,16,17,18,19 diagram is -       0           0   0       0   57   0   0   0   0   0   Any ideas ? this has to be in in just over 24 hrs ......help! Answered by Chris Fisher.
	Expressing 0.5%		2012-02-06
		From Kenneth: Hello: It is correct to express 0.5% as 5 tenths of one percent. Is it also correct to express 0.5% as 5 tenths of one-hundred percentage points or 5 tenths of one percentage point? I think it would be 5 tenths of one percentage point because 5 tenths of one-hundred percentage points would be 50 percentage points, but I'm not sure. I thank you for your reply. Answered by Penny Nom.
	5 crayons		2011-09-17
		From John: How many four color combinations are possible with 5 crayons Answered by Penny Nom.
	58 choose 4		2011-08-26
		From Jean: Using only the numbers 1-59, how many times would the number 23 appear in combinations of 5 numbers? ... Can a list be provided as well? Thank you very much, Jean Answered by Penny Nom.
	25 billion dollars		2011-08-26
		From Bill: If you have $25billion dollars, what would the value of this amount become if you inflated it at 4% per year for 55 years?=C2=A0 My TVM calculator will not go this high. Answered by Penny Nom.
	5 digit numbers using the digits 5 and 2		2011-04-27
		From sissy: I need a list of all possible 5 digit combinations using 5 and 2 numbers can repeat Answered by Penny Nom.
	Converting base 3 to 5		2011-02-28
		From Harry: Hey Math Central, I came across your website and im in need of help on my maths c assignment. I have to convert base 3 to 5 without converting back to ten. I heard that you can use patterns in 3 and 5 to make an equation but im not sure how to and i also heard you can use logarithms but i dont know how to use those so im kinda stumped. Answered by Robert Dawson.
	A golf holiday		2011-01-04
		From Andy: You kindly responded to a question I previously sent with regard to a Golf Holiday and I wonder if I might ask another question please. There are now 7 players playing 5 rounds of golf and I wonder if it is possible to devise a schedule where everyone plays with each other a minimum of two times i.e. they will play twice with some and three times with others. As always, many thanks for your kind assistance. Answered by Victoria West.
	The new diameter is 50 per cent larger than the original.		2010-09-04
		From mahwish: . A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 per cent larger than the original. By what percentage has the area of the logo increased? Answered by Tyler Wood.
	Divisibility by 3		2010-05-23
		From Cathleen: To math central. I have to do a maths extension question that I don't understand. At first I thought I did. It is about the dividing by three. In one part of the question, it asks me to show that the rule of division by three does not work for 23142 with a little 5 down the bottom. What doe base 5 mean? We first thought that the little 5 down the bottom meant multiplying y the power of five. Can you please tell me what it means so I can finish this question? Answered by Penny Nom.
	A set of 5 numbers		2010-01-10
		From Marco: I need to generate in an Excel or other table all possible combinations for a set of 5 numbers with the following criteria: 1.- Numbers can repeat. 2.- Order does not matter. 3.- Numbers may be from 0-9 4.- The sum of all numbers is equal or less than 31. 5.- The sum of all numbers is equal or greater than 10. 6.- One of the numbers is 2. 7.- One of the numbers is 5. 8.- One of the numbers is 7. Marco Answered by Penny Nom.
	15 golfers 3 rounds fivesomes		2009-12-23
		From Dewey: I have 15 golfers playing 3 rounds of golf. We will be playing in fivesomes. Any formula that has everyone playing with a different person each round? Thank you. Dewey Answered by Robert Dawson.
	6 numbers from 53 numbers		2009-11-17
		From MIGUEL: IM A STUDENT IN HIGH SCHOOL AND IM HELPING THE SOCCER COACH WITH PLAYS SO I NEED ALL THE POSSIBLE NUMBER COMBINATIONS OF NUMBERS 1- 53 IN SETS OF SIX THE NUMBER CAN ONLY BE USED ONCE IN EACH SET. Answered by Penny Nom.
	A 15 acre lot		2009-09-26
		From Ronald: The front and back are equal and the two sides are equal what would what would be the dimensions of a 15 acre lot? Answered by Harley Weston.
	Sandra's age		2009-09-24
		From cindy: Sandra is more than 20 years old and less than 60 years old. You can count by 7's to reach Sandra's age. Next year you will be able to count by 5's to reach Sandra's age. How old is Sandra? Answered by Penny Nom.
	A 5 foot strip around a building		2009-08-20
		From Robert: I am having a problem at work that I am hoping someone can help me figure out. I have a pest control company and we are pretreating the soil for a new hospital being built. The company that we are working has asked to also treat a 5 foot strip around the entire building and for us to get paid we need to figure out what the square footage of this 5 foot strip around the building that we are treating. The structure being built is a hospital and as you can imagine the building has all kinds of nooks and offsets and even some of the wall are cruved more like a circle. I already know the square footage of the building itself because they gave us this information. The square footage of the building is 120,000 SqFt. I would greatly appreciate if someone can help me figure out the square footage of a 5 foot strip around a 120,000 SqFt building who's walls have a lot of insets and odd shapes. I don't if someone can figure out the square footage of the 5 foot strip with the information I gave. I would greatly appreciate any help that you can give me. I need this information for work because we charge for pretreatment of soil by the square footage of the area to be treated and I need this information so that I don't over charge the company we are working for or so I don't cheat myself either. Any and all help we be greatly appreciated because I don't know who else that can help me. Answered by Victoria West.
	Golf for 15		2009-08-18
		From Judy: We have a group of 15 golfers that play a scramble with groups of 3. The problem is we play for 14 weeks. We want every player to play at least once with everyone and no more that 3 times. I am working on this and have just about accomplished the schedule, but with a few playing more than 3 times. I'm sure there must be some mathematical calculation to do this but I have yet to figure it out. Answered by Victoria West.
	A football schedule		2009-08-14
		From Bill: I am having trouble with a football schedule that has two divisions of five teams each, 1-5 and 6-10. 1-5 will play against each other in the first 4 weeks and also the the last 4 weeks with teams 6-10 completing the middle of the schedule. The schedule is 13 weeks. Thank you for your time Answered by Chris Fisher and Victoria West.
	Subtraction base 5		2009-08-09
		From Nikki: can you help me how to do subtraction in base 5 notation. example is 3434 - 51? how do you do this in base 5? can you please explain how you do this & the answer as i have no idea. Thank you kindly Nikki Answered by Harley Weston.
	Two questions from math class		2009-06-18
		From Con: Hello, My name is Con and my son is required to answer the following questions for his maths class. He has attempted Q1 through trial and error and has found the answer to 72453. Is this correct? He has attempted to draw the triangles described in Q2 in a number of ways and has found that BE can not equal ED and is dependent of angle BAC. Therefore, he claims that the triangle can not be drawn/practical. Is this correct or is there a slolution? Q1. Digits 2, 3, 4, 5 and 7 are each used once to compose a 5-digit number abcde such that 4 divides a 3-digit number abc, 5 divides a 3-digit number bcd and 3 divides a 3-digit number cde. Find the 5-digit number abcde. Q2. Let ABC be a triangle with AB=AC. D is a point on AC such that BC=BD. E is a point on AB such that BE = ED = AD. Find the size of the angle EAD. Con Answered by Chris Fisher.
	What is the original number?		2009-04-16
		From Yueh: A five digit number is written on a blackboard. Ron erases one of the digits and adds a newly constructed number to the original one. The result is 41751. What is the original number? Answered by Claude Tardif.
	A 5 digit push combination lock		2009-04-04
		From Andrew: I have a 5 digit push combo lock that i forgot the combo for. it has numbers 1-4 and each number can be pressed more then once ie. 11111, 36356 is there an algorithm out there that will list out the possible combinations for me? or maybe a way i could write them out myself. Answered by Penny Nom.
	0123456789		2009-03-25
		From Dr.: Many years ago I discovered that there are 33 numbers which, when multiplied by 0123456789, simply rearrange the digits. Surprisingly (to me at least) is the fact that the digits of all of those 33 numbers add up to one of the 6 "cardinal" numbers 1, 2, 4, 5, 7, and 8. For example 6 + 2 = 8 and 62 X 0123456789 = 7654320918 etc. Another interesting (to me) fact is that only the cardinal numbers 1, 2, 4, 5, 7, and 8 rearrange the digits in the number 9876543210. My question is: "Is this known to anyone but me and the people I have told?" Answered by Robert Dawson.
	The area of a 5-sided lot		2009-03-02
		From Linda: I have a problem I'm hoping you can provide some help with. When I check the property information for our home on our District of North Vancouver website, it shows that our property is supposed to be 1146.99 Square Metres. Yet another property which has identical measurements is listed as having 1173.7 Square Metres. I would like to figure out who is correct. Answered by Harley Weston.
	5 "digit" combinations		2009-01-22
		From Timothy: I was wondering how many different 5 digit combinations are possible using 0-9 and a-z and you can use the same letter or number repeatedly in the combination. Answered by Penny Nom.
	5 yards of concrete		2009-01-08
		From jon: To mix 5 yards of concrete, how many loads will I need to mix in a 4.5 cubic feet mixer? Thanks, jon Answered by Robert Dawson.
	Combinations of Golf Groups		2008-12-05
		From Duane: We have a golf outing coming up with 25 golfers playing 5 rounds in 5-somes. Is there a formula to figure out where everyone can play with different people each round? Thanks, Duane Answered by Victoria West.
	Cutting a pipe on a 45 degree angle		2008-09-12
		From Bakshani: how do you a mark a pipe 5 inch diameter and cut it to form a 45 degree angel Answered by Stephen La Rocque.
	Choosing 5 numbers out of 39 numbers		2008-07-18
		From robert: Please list the way I can choose 5 numbers out of 39 numbers, without repeating them, starting at number 1. Please send me a list of all 120 combination. Answered by Harley Weston.
	Zip codes, postal codes and 5 digit codes		2008-07-08
		From Mike: Sorry if you have answered this before but I don't understand the explanations I have seen. How many possible combinations are in a 5 digit code (like a Zip Code). Is there an equation that can be used for this type of question? Answered by Penny Nom.
	The area of a 5-point star		2008-06-27
		From rebecca: Hello, For a maths extension program i've been given the challenge of finding the area of a 5-point star with each of the 10 outside edges being a length of 1.23cm How might I go about finding the area for such a shape given only this piece of information? Sincerely, Rebecca Answered by Janice Cotcher.
	The sum of some 5 digit numbers		2008-04-05
		From Tom: There are 120 five-digit numbers that use all the digits 1 through 5 exactly once. What is the sum of these 120 numbers? Answered by Penny Nom.
	Base 5 arithmetic		2008-03-06
		From Jana: Hello, my name is Jana, i have asked a question here previously about how to count in base-5. I am happy now because i can convert any number now and it is very easy for me. The only thing i am having trouble with is understanding how to do a maths sum or times base-5 numbers. it is just a bit hard for me. So do you think you could explain how to do a sum in base-5 and how to do a multiplication sum. Please help...Thankyou Jana!! Answered by Harley Weston.
	Counting in base 5		2008-02-24
		From Jana: my name is Jana, i really need help with a maths question at school. Im confused about how to count up from1-20 in a base-5 format! I'm in year 5 and i really don't get all the complicated stuff. Answered by Stephen La Rocque.
	Five digit combinations		2008-02-15
		From Debbie: I would like to get a list of all the possible 5 digit combinations of the numbers 12345. Answered by Penny Nom.
	Base 10 to base 5		2007-10-09
		From Angela: I've been searching online for the past week and I cannot find an Algorithm to convert from base 10 to base 5. Can anyone give me a step-by-step instruction on how to do this? Answered by Stephen La Rocque.
	Base 5		2006-12-11
		From Shelley: how do you convert decimal numbers to a given base for example 2,875 to base five? Answered by Stephen La Rocque.
	A triangle of 50p pieces		2006-02-22
		From Stuart: Ok, so i am collecting 50p pieces and arranging them on my desk in the shape of a triangle. eg 50p 50p 50p 50p 50p 50p 50p 50p 50p 50p I want to work out how much money I'm saving just by knowing how many rows of coins there are. If i can work out how many coins there are just by knowing how many rows I have I can just divide by 2 to find out the amount in dollars. Answered by Penny Nom.
	Four 25-sided dice		2005-11-24
		From dan: Simply put, I am curious to find the likelyhood of each possibility (4-100) if I were to roll 4 25-sided die. It seems to start off simply, as 1, 4, 10, 20...following the inside diagonal of Pascal's triangle. But as soon as i reach the point where the sum is greater than the number of sides, Pascal's no longer seems to work. I would be greatly appreciated if I could be informed of the proper formula to find this answer, or perhaps if my theory of doing it is wrong. Answered by Andrei Volodin and Shaun Fallat.
	The value of n*tan*(180/n) tends to pi		2005-07-11
		From Daniel: I am 14 and i have been given a piece of maths coursework whereby a farmer has to fence off a piece of land as large as possible using 1000m of fence. I already know that the formula for working out the area of any shape of a 1000m perimeter = 5002/ n*tan*(180/n), however, after some research I have found out that as the number of sides (n), tends to infinity, the n*tan*(180/n) tends to pi. Why is this? Answered by Penny Nom.
	Divisibility by 15		2004-12-19
		From Lisa: My son was asked to find divisiblity rules for 15. We have been unable to find the answer. Does it exist? Answered by Leeanne Boehm and Denis Hanson.
	Choosing 5 numbers from 1,...,36		2004-06-30
		From A lottery player?: how many combinations are there for the numbers 1thru 36 when only using each number once in groups of five Answered by Penny Nom.
	A fifteen sided polygon		2004-03-05
		From Joann: WHAT IS THE NAME OF A FIFTEEN SIDED SHAPE? Answered by Penny Nom.
	Cosine of 35 degrees		2004-03-03
		From Jason: How do you find the exact solution to cosine 35 degrees. Answered by Chris Fisher.
	Arithmetic in bases other than 10		2003-10-22
		From Kim: how do you add, subtract, multiply and devide in base 3, base 5, etc? Answered by Penny Nom.
	Converting from base 10 to base 5		2003-09-10
		From Susy: My son, who is 9 in grade 5 has been asked to convert base 10 numerals into base 5. His first question of: 24(10) he has calculated to be 4x5 + 4x1 = 44 (5) The next question however is the tricky one.Ý We know the answer is supposed to be 100 but we find it difficult to get this in the way he understands it. 25 (10) = _________________ 100 (5) Can you help us figure out how we reach the answer. Answered by Claude Tardif and Penny Nom.
	Polynomials degree 4 and bigger		2003-06-26
		From Stephen: How do I show kids how to find all the zeros for polynomials degree 4 and bigger. For examples: r(x) = x5-11x3-7x2+77 = (x2-11)(x3-7) and s(x) = x4-121 = (x2-11)(x2+11) Also am I correct when I say that the following are irreducible? f(x) = x2-11 g(x) = x3-7 h(x) = x4-5 Answered by Harley Weston.
	5 to the power n		2003-05-28
		From Sam: What is the integer n for which 5 to the n power + 5 to the n power + 5 to the n power + 5 to the n power + 5 to the n power = 5 to the 25th power? Answered by Penny Nom.
	Numbers in base 5		2003-02-16
		From Lori: I'm trying to help my 6th grader with converting numbers like 82 to base 5 and 182 to base 12. We saw your examples on 613, but still are confused. Answered by Penny Nom.
	Some 5th grade problems		2003-01-24
		From Sabrina: [What is the greatest common factor of 20,28, and 36?] next problem is [5k+7(k+8)= ] next problem [Curtis simplified 0.8 divided by 0.2 x 0.04 and got 10. Latoya Simplified and got 1.6. is either correct? Can you explaine how you got the answer please.] Answered by Penny Nom.
	Base 5 numbers		2002-09-13
		From Vera: ? how do you change a base 10 number to base 5 Answered by Penny Nom.
	Some 5 card hands		2002-03-28
		From A student: From a standard deck of cards how many 5 card hands are possible consisting of a. exactly 4 hearts b. two cards of one kind and three of another(like a full house). Answered by Penny Nom.
	A degree 5 polynomial		2002-02-17
		From Carla: Write an equation for a polynomial of degree 5 given the following zeros: -7+3i, -2+sqrt(13), 6 Answered by Penny Nom.
	50%		2002-01-15
		From Lakarrieh: 4 is 50% of what number? Answered by Penny Nom.
	450 students		2001-12-19
		From Jessie: My teacher told me that the number of ways of lining up the 450 students in our school is larger than the number of atoms in the universe. Is this right? This question came to Good Question, a regular feature on the CBC Morning Edition radio show in Saskatchewan. Answered by Denis Hanson and Harley Weston.
	A 3 dimensional 5 pointed star		2001-11-08
		From Kent: I am looking for a formula that will give me a layout for a 3 dimensional 5 pointed star. I want to form it out of sheet metal, using 5 polygons and soldering them at the apex. Can you please help me with this? I would like to be able to give the formula the height of the star from the bottom two points to the top point and also how deep the star is. Thank you very much! Answered by Judi McDonald.
	1:5		2001-09-27
		From Sandy: A colleague and I have a disagreement about dilutions. I seem to remember that I was taught (although it was a long time ago) that a RATIO was written thusly: 1:5 , and read " one part to five parts", for a total of 6 parts. On the other hand, a fraction is written: 1/5 and is read" one part in five" for a total of 5 parts. My colleague says that the ratio reads "one part in five" and is essentially the same as a fraction. Which is right? Have I been doing dilutions wrong all this time? I teach Animal Nursing and need to know where I can find a consise answer to such questions for making up medicated fluids, etc. Answered by Penny Nom.
	Five		2001-04-21
		From Billie: If One is single, two is twin, three is triple, four is quadruple, five is ????? what is five and where would I find the rest of the numbers,six, seven, eight, nine, etc. Answered by Penny Nom.
	Five fourths		2001-04-08
		From Linda: Can you have 5/4 of something? Answered by Penny Nom.
	Arithmetic in base 5		2000-09-20
		From Lesley Emerson: my daughter is 9 and has been aske to solve the following in base 5 3+2 4+10 . . . Answered by Penny Nom.
	1234567890		2000-09-14
		From Bradley Kloetzly: Can you find two whole numbers, with the smallest possible difference between them, which when multipled together equal: 1234567890? Answered by Harley Weston.
	Five Factors		1998-09-19
		From Derek Yau: To whom it may concern, I have difficulty in getting the solution to the following question: Find 5 numbers that have exactly 5 factors. I got 16, 81 but couldn't find the rest. I believe that in order to have 5 factors, it has to be a square number. Isn't it true? I guess there may be a pattern to this. Thanks for your help. Derek Yau. Answered by Penny Nom.

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