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

[EX Q]: Problem: 10 women can complete a work in 5 days and 10 children take 10 days to complete the work . how many days will 5 women and 10 children take to complete the work ?
[EX A]: 5

[EX Q]: Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
[EX A]: 180 meter

[EX Q]: Problem: the least perfect square , which is divisible by each of 21 , 36 and 66 is
[EX A]:
213444