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: if a drawing has an outer circle of diameter 30 and an inner circle of diameter 24 , then what fraction of outer circle ' s surface is not covered by the inner circle ?
[A]: 9 / 25', 'e ) 2 / 3'


[Q]: Problem: what is the smallest positive integer x , such that 1944 x is a perfect cube ?
[A]:
3