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.

[EX Q]: For Halloween Sarah received 66 pieces of candy from neighbors and 15 pieces from her older sister . If she only ate 9 pieces a day , how long would the candy last her ?
[EX A]: 9

[EX Q]: For a birthday party Tom bought 4 regular sodas and 52 diet sodas . If his fridge would only hold 7 on each shelf , how many shelves would he fill up ?
[EX A]: 8

[EX Q]: A teacher had 38 worksheets to grade . If she graded 4 , but then another 15 were turned in , how many worksheets would she have to grade ?
[EX A]:
49