Question

40 persons can repair a bridge in 12 days. If 8 more persons join them, then in how many days bridge can be repaired?

• A. 11 days
• B. 10 days
• C. 9 days
• D. 8 days

Answer 1

Answer:

B. 10 days

Solution: Given: 40 persons can repair a bridge in 12 days Concept: Work = Total manpower × Total days M1D1/W1 = M2D2/W2 Calculation: M1 = 40, D1 = 12, M2 = 48, D2 = y (Let) Using the formula M1D1/W1 = M2D2/W2 ⇒ 40 × 12 = 48 × y ⇒ y = (40 × 12/48) = 10 ∴ 48 persons can repair a bridge in 10 days.