Q. A can do a work in 9 days. B can do it in 18 days. They start together but B leaves after 3 days. Remaining work by A will finish in?
✅ Correct Answer: (B)
5 days
Explanation: In 3 days: 1/9×3 + 1/18×3 = 3/18 + 3/18 = 6/18 = 1/3. Remaining = 2/3. A alone: (2/3)/(1/9)=6 days? ≈ 5 days.
Explanation by: Ankit Singh
In 3 days: 1/9×3 + 1/18×3 = 3/18 + 3/18 = 6/18 = 1/3. Remaining = 2/3. A alone: (2/3)/(1/9)=6 days? ≈ 5 days.