Marco and his dad went strawberry picking. Marco's strawberries weighed 17 pounds. If together their strawberries weighed 42 pounds. How much more did his dad's strawberries weigh than his?
1) Marco's strawberries weigh 17 pounds. 
2) Together, Marco and his dad's strawberries weigh 42 pounds. 
3) Marco's dad's strawberries weigh more than Marco's strawberries. 

We can set up an equation to solve this problem: 

17 + x = 42 

x = 42 - 17 

x = 25 

Marco's dad's strawberries weigh 25 pounds.