40 men can complete a piece of work in 18 days. 9 days after they start working together, 5 more men join them. How many days will they now take to complete the remaining work?
Explanation:
After 9 days, work left for 40 men is for 9 days.
Now, since 5 men join, let the work gets completed in another 'd' days.
∴ 40 × 9 = 45 × d
⇒ d = 8 days.
∴ The remaining work gets completed in 8 days.
Hence, option (b).