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: Mary is baking a cake. The recipe calls for 6 cups of flour 8 cups of sugar and 7 cups of salt. She already put in 5 cups of flour. 

 Question: How many more cups of sugar than cups of salt does she need to add now?

A: 1
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Q: Context: Paul had 21 books. After selling some in a garage sale he bought 42 new ones. If he has 15 books now 

 Question: How many more books did he sell than he bought?

A: 6
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Q: Context: Baker made 61 pastries and 167 cakes. If he sold 108 cakes and 44 pastries 

 Question: How many cakes would baker still have?

A:
59
****