Question

The efficiency of A and B to do a work is in the ratio 3 ∶ 5. Working together they can complete a work in 30 days. In how many days A alone will complete that work?

• A. 56
• B. 80
• C. 72
• D. 48

Answer 1

Answer:

B. 80

Solution: Given: Efficiency of A and B is in the ratio 3 : 5 They can complete a work in 30 days by working together Calculation: Total efficiency of all working together = 3 + 5 = 8 Total work done in 30 days = 8 × 30 Let A will complete the work in n days, working alone ⇒ 3n = 8 × 30 ⇒ n = 80 ∴ A alone will complete the work in 80 days