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: Winter is almost here and most animals are migrating to warmer countries. There are 38 bird families living near the mountain. If 47 bird families flew away to africa and 94 bird families flew away to asia 

 Question: How many more bird families flew away to asia than those that flew away to africa?

Answer: 47


Question: Context: A grocery store had 36 apples, 80 bottles of regular soda and 54 bottles of diet soda. 

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

Answer: 98


Question: Context: A book has 3 chapters. The first chapter is 35 pages long the second chapter is 18 pages long and the third chapter is 3 pages long. 

 Question: How many more pages does the second chapter have than the third chapter?

Answer:
15