6
Q:
A) [7 + (215/345)] days | B) [6 + (11/215)] days |
C) [6 + (261/315)] days | D) [5 + (112/351)] days |
Answer: C) [6 + (261/315)] days
Explanation:
Explanation:
After day 1, A finishes 1/9 of the work.
After day 2, B finishes 1/7 more of the total work. (1/9) + (1/7) is finished.
After day 3, C finishes 1/5 more of total work. Total finished is 143/315.
So, after day 6, total work finished is 286/315.
Now remaining work = 29 /315
On day 7, A will work again
Work will be completed on day 7 when A is working. He must finish 29/315 of total remaining work.
Since he takes 9 days to finish the total task, he will need 261/315 of the day.
Total days required is 6 + (261/315) days.