Name: Oliver Who is asking: Parent Level of the question: Elementary Question: I am a father of a 10 years old boy and sending this question from Bangkok, Thailand. I need solutions for the following: 1 Joseph and Peter spent \$45 altogether. Joseph and Harold spent \$65 altogether. If Harold spent 3 times as much as Peter, how much did Joseph spent? I know the answer is \$35 but do not know how to get to it. 2 Ron bought 3 notebooks and a newspaper. He paid \$30 to the cashier and received \$5 change. If the newspaper cost twice as much as each notebook, find the cost of the newspaper. I know the answer is \$10 but do not know how to get to it. 3 Paul has twice as many stickers as Andy. Andy has 40 more stickers than Lily. They have 300 stickers altogether. How many stickers does Paul have? I have no idea how to get it. 4 The total weight of Peter, Dan and Harry is 123 kg. Peter is 15 kg heavier than Dan. Dan is 3 kg lighter than Harry. Find Harry's weight? I have no idea how to get it. I thank you very much for your kind help Regards Oliver Oliver, I will do one of the problems for you to give you an idea of a way to solve them. I am going to use algebra as I expect that is what is expected. Here is a solution to problem 4. Let P be Peter's weight, D be Dan's weight and H be Harry's weight, all in kilograms. The three statements in this problem then can be written as equations The total weight of Peter, Dan and Harry is 123 kg. P + D + H = 123 Peter is 15 kg heavier than Dan. P = D + 15 Dan is 3 kg lighter than Harry. D = H - 3 I want to obtain one equation with only one letter (variable) in it. In the first equation I ca replace P by D + 15 to get D + 15 + D + H = 123 or 2D + 15 + H = 123 The third equation is D = H - 3 so H = D + 3. Hence in the equation above replace H by D + 3 to get 2D + 15 + D + 3 = 123 or 3D + 18 = 123. Subtract 18 from each side to get 3D = 105, and thus D = 35 kg But you want Harry's weight which is 3 kg less than Dan's weight so Harry's weight is 32 kg. Penny