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]: The school cafeteria had 23 apples . If they used 20 to make lunch for the students and then bought 6 more , how many apples would they have ?
[EX A]: 9

[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]: A pet store has 8 bird cages . If each cage has 2 parrots and 7 parakeets in it , how many birds does the pet store have total ?
[EX A]:
72