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: A book has 2 chapters across 81 pages. The second chapter is 68 pages long. 

 Question: How many pages are in the second chapter?

A: 13
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Q: Context: He then went to see the oranges being harvested. He found out that they harvest 5 sacks of ripe oranges and 74 sacks of unripe oranges per day. 

 Question: How many more sacks of unripe oranges than ripe oranges are harvested per day?

A: 69
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Q: Context: A farmer had 175 tomatoes and 77 potatoes in his garden. If he picked 172 potatoes 

 Question: How many tomatoes and potatoes does he have left?

A:
80
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