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

[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: a man can row 6 kmph in still water . when the river is running at 3 kmph , it takes him 1 hour to row to a place and black . what is the total distance traveled by the man ?
[A]: 4.5


[Q]: Problem: of the seven - digit positive integers that have no digits equal to zero , how many have two digits that are equal to each other and the remaining digit different from the other two ?
[A]:
152409600