A can do a work in 18 days. He started the work and worked for 9 days alone and after that completed the work with B in 4 days. How many days both take to complete the work?
1
6 days
2
12 days
3
10 days
4
8 days
5
None of the above
A can do a work in 18 days. He started the work and worked for 9 days alone and after that completed the work with B in 4 days. How many days both take to complete the work?