Marco and his dad went strawberry picking. Together they collected strawberries that weighed w pounds. On the way back Marco ' dad lost x pounds of strawberries. Marco's strawberries now weighed y pounds. How much did his dad's strawberries weigh now?
1. Marco and his dad went strawberry picking. Together they collected strawberries that weighed w pounds.

2. On the way back Marco's dad lost x pounds of strawberries.

3. Marco's strawberries now weighed y pounds.

Now we have to solve for his dad's strawberries. We know that together they had w pounds of strawberries and we know that Marco's strawberries weigh y pounds. So we just have to solve for x.

w - y = x

x = w - y