Given the task definition and input, reply with output. You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Context: Last week Fred had 111 dollars and Jason had 40 dollars. Fred washed cars over the weekend and now has 115 dollars. Jason delivered newspapers and now has 44 dollars. 

 Question: How much money did they earn by washing cars?

4