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

Q: Problem: the ratio of a to b is 4 to 5 , where a and b are positive . if x equals a increased by 25 percent of a , and m equals b decreased by 60 percent of b , what is the value of m / x ?

A: 2 / 5
****
Q: Problem: a man is 28 years older than his son . in two years , his age will be twice the age of his son . the present age of the son is ?

A: 26
****
Q: Problem: if d is the smallest positive integer such that 3,150 multiplied by d is the square of an integer , then d must be

A:
14'
****