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

[EX Q]: Problem: a contractor undertook to do a piece of work in 18 days . he employed certain number of laboures but 9 of them were absent from the very first day and the rest could finish the work in only 6 days . find the number of men originally employed ?
[EX A]: 4.5

[EX Q]: Problem: if each side of a square is increased by 325 % in length , find the percentage change in its area ?
[EX A]: 956.25 %

[EX Q]: Problem: a man whose speed is 3 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph , find his average speed for the total journey ?
[EX A]:
3.