Question

12 men can complete a work in 18 days 6 of 6 days after they started working for more men joined them

Answer 1

Let the work completed by 1 man in 1 day be y.

So, the total work = 12 X 18 X y = 216y

12 men worked for 6 days, so total work completed = 12 X 6 X y = 72y

Remaining work = 144y

Total men now = 12 + 4 = 16

Work done in a day = 16y

Days required = Total work/Work in a day = 144y/16y = 9.

I HOPE IT HELPS.