S does half as much work as T in 1/7 of the time taken by T. If together they take 21 days to complete a work, then how many days shall S take to complete that work alone?
1
26
2
27
3
28
4
32
S does half as much work as T in 1/7 of the time taken by T. If together they take 21 days to complete a work, then how many days shall S take to complete that work alone?