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.
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Question: Context: Jessie weighed 71 kilograms. After she started to go jogging everyday she lost 20 kilograms. 

 Question: How much does she weigh now?

Answer: 51


Question: Context: A grocery store had 72 bottles of regular soda, 32 bottles of diet soda and 78 apples. 

 Question: How many more bottles than apple did they have?

Answer: 26


Question: Context: David did 27 more push-ups but 7 less crunches than Zachary in gym class today. If Zachary did 5 push-ups and 17 crunches 

 Question: How many more crunches than push-ups did Zachary do?

Answer:
12