Last week Fred had 22 dollars and Jason had 47 dollars. Over the weekend Fred delivered newspapers earning 30 dollars and washed cars earning 42 dollars. How much money did Fred earn over the weekend?
Fred had 22 dollars last week. 
He earned 30 dollars from delivering newspapers. 
He earned 42 dollars from washing cars. 

Adding those three numbers together, we get that Fred earned 94 dollars over the weekend.