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

[EX Q]: Problem: a can do a piece of work in 22 days and b alone can do it in 10 days . b works at it for 5 days and then leaves . a alone can finish the remaining work in
[EX A]: 11 days

[EX Q]: Problem: find the least number must be subtracted from 105829 so that remaining no . is divisible by 21 ?
[EX A]: 10

[EX Q]: Problem: the average of first five multiples of 6 is ?
[EX A]:
18