Respuesta :

dmressels

Answer:

$10

Step-by-step explanation:

100% is $40

Every 25% is $10

So he has 25% or $10 left

Let X be a number of weeks, than you have

(60 + 7 * X) - ( 120 + 5 * X) = 0

Solve for X and you get X = 30 weeks

The key here is to recognize that when they both have equal amounts the difference between their amounts  will be 0c