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.

[EX Q]: will had 28 bottles of water . if he drank 7 each day how many days would they last him ?
[EX A]: 4

[EX Q]: after the day they were able to make 6 institutions happy . if each institution has 80 people . how many people were made happy by the mayor and vice-mayor ?
[EX A]: 480

[EX Q]: christine has 11 stickers on her good helper chart . she needs 30 stickers to get a prize . how many more stickers does christine need ?
[EX A]:
19