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

[EX 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 ?
[EX A]: 26

[EX Q]: Problem: a is twice as good a workman as b and they took 6 days together to do the work b alone can do it in .
[EX A]: 18 days

[EX Q]: Problem: a 11 % stock yields 8 % . the market value of the stock is :
[EX A]:
rs . 137.50