You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[Q]: Context: Marco and his dad went strawberry picking. Together their strawberries weighed 35 pounds. Marco's strawberries weighed 13 pounds. 

 Question: How much more did his dad's strawberries weigh than his?
[A]: 9


[Q]: Context: Paul got a box of 601 crayons and 406 erasers for his birthday. At the end of the school year he only had 336 crayons left while not having lost a single eraser. 

 Question: How many more erasers than crayons did he have left?
[A]: 70


[Q]: Context: Danny collects bottle caps and wrappers. He found 46 wrappers and 50 bottle caps at the park. Now he has 21 bottle caps and 52 wrappers in his collection. 

 Question: How many more bottle caps than wrappers did danny find at the park?
[A]:
4