Sao kkkkkkkkkks
10/03/2017 at 12:12
Nguyễn Việt Hoàng 10/03/2017 at 12:15
In one hour the three of them did the job:
1: 3 = 1/3 (work)
In the first hour the number of jobs is:
1: 8 = 1/8 (work)
In one hour the second person to do the job is:
1:12 = 1/12 (work)
In one hour the third person to do the job is:
1/3  1/8  1/12 = 1/8 (work)
The third person who finishes work alone in time is:
1: 1/8 = 8 (hour)Answer: 8 hours

Faded 26/01/2018 at 12:27
In one hour the three of them did the job:
1: 3 = 1/3 (work)
In the first hour the number of jobs is:
1: 8 = 1/8 (work)
In one hour the second person to do the job is:
1:12 = 1/12 (work)
In one hour the third person to do the job is:
1/3  1/8  1/12 = 1/8 (work)
The third person who finishes work alone in time is:
1: 1/8 = 8 (hour)Answer: 8 hours