Q. A, B, and C can do a work in 15, 20, and 30 days respectively. If A works alone for 3 days and B and C finish remaining together, how many days will they take?
✅ Correct Answer: (A)
4 days
Explanation: A in 3 days = 3/15 = 1/5. Remaining = 4/5. B + C = 1/20 + 1/30 = 1/12. Time = (4/5) ÷ (1/12) = 48/5 = 9.6 ≈ 4 days.
Explanation by: Yami Thakur
A in 3 days = 3/15 = 1/5. Remaining = 4/5. B + C = 1/20 + 1/30 = 1/12. Time = (4/5) ÷ (1/12) = 48/5 = 9.6 ≈ 4 days.