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]: Kylie was collecting coins . She got 15 coins from her piggy bank and 13 coins from her brother . Her father gave Kylie 8 coins . Kylie gave 21 of the coins to her friend Laura . How many coins did Kylie have left ?
[EX A]: 15

[EX Q]: Nancy 's class is going on a field trip to the zoo . If each van can hold 5 people and there are 12 students and 3 adults going , how many vans will they need ?
[EX A]:
3