Marco and his dad went strawberry picking. Together they collected strawberries that weighed 24 pounds. On the way back Marco lost 9 pounds of strawberries. Marco's strawberries now weighed 3 pounds.
Question: How much did his dad's strawberries weigh?
Equation: ( 24.0 - ( 3.0 + 9.0 ) )
Answer: 12 (Subtraction)