If 10 men or 18 women can do a work in 50 days then how many days would it take 25 men and 15 women to do twice the work?

Question: If 10 men or 18 women can do a work in 50 days then how many days would it take 25 men and 15 women to do twice the work?

Solution:
Here,
10 men = 18 women
∴ 1 men = 18/10 women
∴ 25 men = (18 × 25)/10 women
= 45 women

∴ 25 men and 15 women = (45 + 15) = 60 women

ATQ,
18 women can do the work in 50 days
∴ 1 women can do the work in = (50 × 18) days
∴ 60 women can do the work in (50 × 18)/60 days
= 15 days

Hence to do twice the work time need = (15 × 2) = 30 days