To easily achieve this problem just take 5 the amount of miles it took Will to walk to school and add it with 7 the amount of miles it took him the long way to walk home. This can be easily solved in 2 steps.
I got 22 because if u do 20 multiplied by 10% that gives u 2 which u then add onto the 20 to get the starting price. 10% of 22 is 2 and then 22-2 = 20 (if u we’re doing it from the starting price)
