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.

Context: A grocery store had a total of 30 bottles of which 28 were bottles of regular soda and the rest were bottles of diet soda. 

 Question: How many bottles of diet soda did they have?
2

Context: David did 56 more push-ups than Zachary in gym class today. If David did 38 push-ups 

 Question: How many push-ups did Zachary and David do altogether?
20

Context: The grasshopper, the frog and the mouse had a jumping contest. The grasshopper jumped 9 inches. The mouse jumped 3 inches lesser than the frog who jumped 33 inches farther than the grasshopper. 

 Question: How far did the mouse jump?

39