The task is to generate the correct answer for a given math problem.

[Q]: Problem: in a university the average age in an arts class is 21 and average age in technical class is 18 . what is the age average of university if there are 8 arts classes and 5 technical classes ?
[A]: 19.85


[Q]: Problem: the product of two successive numbers is 4160 . which is the smaller of the two numbers ?
[A]: 64


[Q]: Problem: what is the value of ( p + q ) / ( p - q ) if p / q is 6 ?
[A]:
7 / 5