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

[Q]: Joan has 8 orange balloons but lost 2 of them . How many orange balloons does Joan have now ?
[A]: 6

[Q]: Mary had 21 dimes and 38 pennies in her bank . Her dad borrowed 18 pennies from Mary . How many pennies does she have now ?
[A]: 20

[Q]: There are 22 oranges in a box . Paula takes 7 oranges . How many are left ?
[A]:
15