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. How much money did they earn by washing cars?
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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.

We want to know how much money Fred earned by washing cars. 

We know that Fred started with 111 dollars and ended with 115 dollars. So, Fred earned 4 dollars by washing cars.