You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Q: oliver had 16 cherries . after eating some he had 6 left . what 's the difference between the number of cherries that oliver had before eating and the left after eating ?

A: 10
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Q: catherine has 18 bottle caps and 19 blocks . if she shares the bottle caps among 6 friends how many bottle caps does each friend get ?

A: 3
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Q: olivia 's dad took her and some friends out to eat for her birthday . if each meal costs 7 dollars and her dad paid for 3 meals how much did he spend ?

A:
21
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