Last week Fred had 33 dollars and Jason had 95 dollars. Over the weekend Fred delivered newspapers earning 16 dollars and washed cars earning 74 dollars. How much money did Fred earn over the weekend?
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Fred had 33 dollars last week. 
He earned 16 dollars delivering newspapers. 
He earned 74 dollars washing cars. 

So, he earned 16 + 74 = 90 dollars over the weekend.