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

Problem: the ratio of the present age of viju to that of aju is 7 : 2 . 4 years from now , the ratio of the ages of viju to aju will be 5 : 2 . what was viju age 5 years ago ? ( rbi assistant 2015 )
16

Problem: if mn ≠ 0 and 25 percent of n equals 37 1 / 2 percent of m , what is the value of 12 n / m ?
18

Problem: for what value of x between − 7 and 7 , inclusive , is the value of x ^ 2 − 10 x + 16 the greatest ?

− 7