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You are here: Experts > Science > Math for Kids > Word Problems > Advanced algebra
Expert: Scott A Wilson - 10/26/2009
Question
A math teacher has a ream of 500 sheets of graph paper. Each week the advanced algebra class uses 90 sheets.
a. about how many sheets are left after w weeks
b. after how many weeks will there be 50 sheets left
Answer
a. There are 90 used per week, so that is -90w.
They start with 500, so the number of sheet left is 500 - 90w.
b. To solve 500 - 90w = 50, add 90w - 50 to both sides.
That gives us 500 - 50 = 90w.
Combining the 500 - 50. we get 450.
So the answer is 450 = 90w.
Dividing by 90 gives us 450/90 = 5 and 90w/90 = w, so we have 5 = w.
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