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

[EX Q]: Problem: what decimal fraction is 90 ml of a litre ?
[EX A]: . 09

[EX Q]: Problem: a company pays 12.5 % dividend to its investors . if an investor buys rs . 60 shares and gets 25 % on investment , at what price did the investor buy the shares ?
[EX A]: 30

[EX Q]: Problem: the ratio of three numbers is 1 : 2 : 3 and the sum of their squares is 2016 . the sum of the numbers is ?
[EX A]:
b ) 12