Marco and his dad went strawberry picking. Marco's strawberries weighed 18 pounds. If together their strawberries weighed 46 pounds. How much did his dad's strawberries weigh?
Marco's strawberries weigh 18 pounds. 
If together their strawberries weigh 46 pounds, then we can say that 18 + x = 46. 
We want to solve for x, which is how much his dad's strawberries weigh. 
We can subtract 18 from both sides to cancel out Marco's strawberries on the left side. 
This leaves us with x = 46 - 18. 
We can solve this equation by subtracting 18 from 46. 
This gives us the answer x = 28. 
Therefore, his dad's strawberries weigh 28 pounds.