Mohan asked 36 men to build his house in 30 day. 50% of the work got completed in just 10 days. So, Mohan removed some workers. Now, how many persons does he need to complete the remaining work in decided time?

18

50% of the work done by 36 person in just 10 days. It means, remaining 50% work will be done by 36 person in next 10 days.

Therefore,

Remaining work = 36 × 10                   [Total work = men × days]

ATQ, Remaining work is to be completed by 'n' person in 20 days

Hence,

36 × 10 = n × 20

n = 18