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]: Sara had 4 quarters and 8 dimes in her bank . Her sister borrowed 4 dimes . How many dimes does Sara have now ?
[A]: 4


[Q]: Lucy went to the grocery store . She bought 12 packs of cookies and 16 packs of noodles . How many packs of groceries did she buy in all ?
[A]: 28


[Q]: Rachel was organizing her book case making sure each of the shelves had exactly 9 books on it . If she had 6 shelves of mystery books and 2 shelves of picture books , how many books did she have total ?
[A]:
72