A can do a piece of work in 9 days, B can do it in 12 days and C can do it in 30 days. The efficiency of D is given to be twice the efficiency of C. If A worked for 1 day, B worked for 2 days and C worked for 3 days. Find the number of days D will take to complete the remaining work alone?
1
20/3 days
2
25/3 days
3
23/3 days
4
28/3 days
5
None of the above