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

According to the information given, we can create the following equation:

w - x = y

We can solve for x:

x = w - y

Therefore, the weight of Marco's dad's strawberries now is:

w - (w - y) = y