Question

a plumber charges $55 for a service call plus $35 per hour. if the plumber’s bill was $160, how many hours was he there?

Answer 1

It is three hours. If you go to a calculator, and add 55 + 35 you get $90. So, you keep adding +35 until you get your answer, and how many times you put (+35) is how many hours.

Answer 2

He was there for 3 hours cause 3 x 35 = 105 but 105 + 55 = 160