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

[EX Q]: Problem: how many numbers between 400 and 1000 can be made with the digits 2 , 3,4 , 5,6 and 0 ?
[EX A]: 60

[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 man buys 54 pens at marked price of 46 pens from a whole seller . if he sells these pens giving a discount of 1 % , what is the profit percent ?
[EX A]:
16.21 %