If you have a rectangular space with dimensions of 200 ft. x 85 ft., and 32,500 square feet is required by 65 cars, do you have sufficient space for 86 cars?

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)