I'll give you a question, please answer with step-by-step reasoning process.
Jake agrees to work part of his debt off. He owed someone $100 but paid them $40 before agreeing to work off the rest.  He worked for $15 an hour. How many hours did he have to work?

4
He has to work off $100 - $40 = $60.

So he has to work $60 / 15 = 4 hours.

.

Thus, the answer is 4