Marco and his dad went strawberry picking. Together they collected strawberries that weighed 49 pounds. On the way back Marco lost 31 pounds of strawberries. Marco's strawberries now weighed 15 pounds. How much did his dad's strawberries weigh?
1. Marco and his dad went strawberry picking. Together they collected strawberries that weighed 49 pounds.
2. On the way back Marco lost 31 pounds of strawberries.
3. Marco's strawberries now weighed 15 pounds.

4. How much did his dad's strawberries weigh?

We know that Marco and his dad collected 49 pounds of strawberries together. And we know that Marco lost 31 pounds of strawberries on the way back. So that means that his dad's strawberries must have weighed 18 pounds.