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

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

# Answer

4
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
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?
train