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: Mary is baking a cake. The recipe calls for 12 cups of flour 5 cups of sugar and 49 cups of salt. She already put in 11 cups of flour. 

 Question: How many more cups of flour does she need to add?
[A]: 1


[Q]: Context: Dan has $ 5. He bought a chocolate for $ 3 and a candy bar for $ 7. 

 Question: How much money did he spend to buy candy bar than he did to buy chocolate?
[A]:
4