A university of Florida student earns 20 per day delivering

A university of Florida student earns $20 per day delivering advertising brochures door to door plus 75cents for each person he interviews. How many people did he interview on a day he earned $56 dollars

Solution

Let say he interviewed x people

So, he will earn, (20 + 0.75 * x) dollar per day

So, 20 + 0.75 * x = 56

or, 0.75 * x = 36

or, x = 48 (ans)

So, 48 people he interiewed on a day he earned $56 dollars