Question

A self-service car wash charges $4 for the initial 5 minutes plus an additional $0.75 for each minute after that. Nick only has $10 to spend on washing his car.

Let m represent the number of minutes after the initial 5 minutes Nick spends washing his car.

Answer 1

he pays $4 for the first 5 minutes then $0.75 for each additional minute

he paid $10

m=the number of extra minutes

0.75m+4=10

0.75m = 10-4

0.75m=6

m = 6/0.75=8

he paid 8min at $0.75

in all it took 13min to wash his car (the first 5 minutes at $4 then 8min at $0.75 /minute)

Explanation: