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 12 cups of flour and 13 cups of sugar. She already put in 2 cups of sugar. 

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

A: 11
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Q: Context: Paul got a box of 253 crayons for his birthday. By the end of the school year he had either lost or given away 70 of them. 

 Question: How many crayons did he have left by the end of the school year?

A: 183
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Q: Context: Baker made 157 cakes and 169 pastries. If he sold 158 cakes and 147 pastries 

 Question: How many more cakes than pastries did baker sell?

A:
11
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