Question

Oceanside bike rental shop charges of 12 dollar fixed fee plus 9 dollars an hour for renting a bike. Sally paid 48 dollars to rent a bike. How many hours did she pay to have the bike checked out?

Answer 1

Explanation:

If h is the number of hours Sally rented the bike then she paid 12 dollars fixed fee plus 9*h.

Which means that she paid 12+9*h.

However she paid 48 dollars which means:

`12 + (9 * h) = 48 \\ 9 * h = 48 - 12 \\ 9 * h = 36 \\ 9 * h = 9 * 4 \\ h = 4`

Which means that Sallly rented the bike for 4 hours