Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

[Q]: a pet store had 68 gerbils . if they sold 14 of them what 's the difference between the number of gerbils that they had before selling and they sold ?
[A]: 54

[Q]: adam has 5 more apples than jackie . jackie has 9 apples . how many apples does adam have ?
[A]: 14

[Q]: there are some children at a bakery . as they were deciding what to buy 24 girls came in and 31 boys left . if there are 78 children in the bakery in the end how many children were there at first ?
[A]:
85