If 3 men or 4 women can built a wall in 43 days, in how many days can 7 men and 5 women build this wall?
Correct Answer: 12 days
Explanation:
3 men = 4 women
∴ 1 man = 4/3 women
∴ 7 men + 5 women = 7 x (4/3) + 5 = 43/3 women
∴ M1D1W2 = M2D2W1
∴ 4 x 43 x 1 = (43/3) x D2 x 1
∴ D2 = 3 x 4 = 12 days
