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A number puzzle |
2009-05-17 |
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From Gita:
Ok, we really need help for a homework problem due on Monday morning
I've been trying for 2 hours and can't figure it out---if I can't I'm not sure
how my son can....We've been given a puzzle with the following rules:
--The sum of each side must equal 15
--We can only use the numbers 1,2,3,4,5,6,7, 8
--A number can be used only once
(Hint: Think of all combinations of 3 numbers = 15)
--The puzzle looks like this:
_____ _______ ______
_____ ______
_____ _______ ______
Answered by Penny Nom. |
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Angles in a triangle |
2009-05-16 |
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From Robert:
The second angle of a triangle is twice the sizee of the first angle, the third angle is 48 degrees less than the sum of the other two angles. What are the measurements of all 3 angles?
PS: please help
Answered by Stephen La Rocque. |
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Hens and roosters |
2009-05-16 |
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From Rogerson:
In a certain poultry farm, the ratio of the number of hens to roosters is 3:5. If 15 new roosters are added, a third of the farm will be compose of hens. Find the original number of chickens.
Answered by Stephen La Rocque. |
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Two Boats |
2009-05-16 |
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From Simon:
Two boats, one travelling towards the east and the other travelling towards the north, are 10 km apart afetr an hour. If the speed of one boat is 2 more than the speed of the other boat, what is the speed of the faster boat?
Answered by Stephen La Rocque. |
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|1/(x+1)| <1 |
2009-05-16 |
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From Nazrul:
What is the solution of absolute value of (1/(x+1))<1? Please explain.
Answered by Stephen La Rocque. |
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A geometric progression |
2009-05-16 |
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From sweta:
find the ratio of GP if the first term is 1 and the sum of third and fifth term is 90.
Answered by Penny Nom. |
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An afternoon at the races |
2009-05-15 |
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From garths:
A professional gambler was betting at a horse racing afternoon.
At the end of the first race he had doubled his money.
He bet R30 on the second race and tripled the money he came with.
He bet 54 on the third race and quadrupled (4 times) the money he came with.
He bet R72 on the fourth race and lost it all. But he still had R48 left.
How much money did he take to the race track?
Answered by Harley Weston. |
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5 spades |
2009-05-15 |
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From Dee:
From a standard deck of 52 cards, how many cards would you have to draw, without looking at them , to be absolutely certain (a probability of 1) that you had 5 spades?
Answered by Robert Dawson. |
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Range and Domain of a Star |
2009-05-14 |
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From Larry:
I am an old teacher trying to help my grandson. He has to draw a structure to scale and then determine the function, domain and range. One line on the structure is from (0,8) to (-8,-4). I used the intercept method and found the function to by y=1.5x +8 (I think) but can't find the range and domain) Thanks
Answered by Janice Cotcher. |
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Finding Height of a Triangle Given Area and Base |
2009-05-14 |
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From theodore:
area of a triangle is 40 in ^2 and base is 4 in what is the height
Answered by Robert Dawson. |
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Formula for Volume and Weight of Water in Pipe |
2009-05-14 |
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From Jonathan:
Do you have a formula for the amount of water that would be in a 12" schedule
forty pipe in gal at any one time. The piping system will be under pressure
but I need to know the overall weight of a single 20' stick of pipe so that
I can determine my spacing for my concrete support inserts.
Thanks.
Answered by Robert Dawson. |
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Ladder Leaning on a Wall |
2009-05-14 |
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From clinton:
a ladder rests against a wall 24m high.the foot of the ladder is 7m from the foot of the wall. How do you calculate the length of the ladder
Answered by Robert Dawson. |
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Cubic Feet for Around a Pool |
2009-05-14 |
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From Traci:
I have a pool that is 24 ft round. I want to put a trim of 2 inch deep and 1 foot wide white rock around the outside. My problem is that here you can only purchase the rock in bags of either 0.5 cu ft or 1 cu ft.
How do I figure out how many bags i will need to do this right?
Answered by Robert Dawson. |
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Fraction Word Problem |
2009-05-13 |
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From Sonya:
Debbie wants to eat 1/6 of her 12 pieces of candy. How many pieces did she eat ?
Answered by Janice Cotcher. |
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Rewriting an Expression with Positive Exponents |
2009-05-13 |
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From lynda:
(-4x)to the 0 power times x squared over 3to the -3 power i have to rewrite the expression with pos exponents
Answered by Janice Cotcher. |
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