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

[Q]: A restaurant served 7 slices of pie during lunch and 5 during dinner today . It served 8 of them yesterday . How many slices of pie were served today ?
[A]: 12


[Q]: Willie starts with 36 stickers . He gives 7 to Emily . How many stickers does Willie end with ?
[A]: 29


[Q]: Donna weighs 69 pounds . Willie weighs 51 pounds . How much heavier is Donna than Willie ?
[A]:
18