Question

trisha is saving $ 25 a week to go a vacations she determines that she will need $350 for the vacations but she also wants to have over $ 100 left in her bank account after the trip. how many weeks should trisha save ?

Answer 1

Let w = number of weeks. She saves 25w dollars. After spending $350 she wants more than $100 left:

25w − 350 > 100
25w > 450
w > 18

So she must save for at least 19 weeks. (19 weeks gives $25·19 = $475; after the $350 trip she has $125 left.)