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: Allan brought 2 balloons to the park and then bought 3 more balloons there. If Jake brought 6 balloons to the park 

 Question: How many more balloons did Jake have than Allan in the park?
[A]: 1


[Q]: Context: The grasshopper and the frog had a jumping contest. The grasshopper jumped 35 inches. The grasshopper jumped 4 inches farther than the frog. 

 Question: How much did they jump altogether?
[A]: 66


[Q]: Context: There are 20 different books in the ' crazy silly school ' series. If you are yet to read 5 of the books 

 Question: How many books have you already read?
[A]:
15