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: A grocery store had 22 bottles of regular soda and 61 bottles of diet soda. 

 Question: How many more bottles of diet soda than regular soda did they have?

Answer: 39


Question: Context: They decided to hold the party in their backyard. They have 4 sets of tables and each set has 3 chairs. If a total of 14 people will attend the party 

 Question: How many more chairs will they have to buy?

Answer: 2


Question: Context: Bobby had 19 pieces of candy. He ate 2 pieces of candy. 

 Question: How many pieces of candy does he still have left?

Answer:
17