Question

It takes 5 men that works 6 hours a day to harvest a field in 20 days. How many days will it take 15 men to harvest the same field if they work 8 hours per day?

Answer 1

M1*D1*T1 = M2*D2*T2
M1 = 5................... M2 = 15
D1 = 20................. D2 = ?
T1 = 6................... T2 = 8

5*20*6 = 15*8*D2
5*120 = 120*D2
D2 = 5
Hence it will take 5 days.