Question

If 12 men or 18 women can complete a piece of work in 7 days in how many days can 4 men and 8 women complete the same work

Answer 1

see, 12 men or 18 women = 7 days
⇒ 12m or 18w = 7
or, 12m = 18w
⇒ 2m = 3w
4m + 8w =?
now,
from , M×D = M'× D'
⇒18w ×7 = (4m +8w)×D'
⇒18w×7 =(6w +8w)×D'
∵ (2m =3w)
∴18w×7 = 14w × D'
⇒D' =9 days
They will take 9 days to complete the same work.

Hope, this will help you :)