Mr. Wilson wants to park his carin a parking garage that charges 3 per hour along with a flat fee of

Mr. Wilson wants to park his carin a parking garage that charges 3 per hour along with a flat fee of 6. If Mr. Wilson paid 54 to park in the garage, for how many hours did he park there?

Set up an equation, where f is the flat fee, and h is the number of hours parked:
3h + f = 54

Substitute f = 6 into the equation:
3h + 6 = 54

Using our equation solver, we get
h = 16