You are given a math word problem and you are supposed to apply multiple mathematical operators 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]: An MP3 player costs 40 dollars . The sales tax is 2.4 dollars . What is the percent of sales tax ?
[EX A]: 6

[EX Q]: At the arcade , Tom won 32 tickets playing ' whack a mole ' and 25 tickets playing ' skee ball ' . If he spent 7 of his tickets on a hat , how many tickets does Tom have left ?
[EX A]: 50

[EX Q]: Tiffany uploaded 7 pictures from her phone and 13 from her camera to facebook . If she sorted the pics into 5 different albums with the same amount of pics in each album , how many pictures were in each of the albums ?
[EX A]:
4