Kusuma does half as much work as Vandana in three-fourth of the time. If together they take 18 days to complete the work, how much time shall Vandana take to do it ?
none of the above
Suppose Vandana takes x days to do the work.
Kusuma takes (2*(3/4)*x) = 3x/2 days to do it.
(Kusuma+Vandana)s 1 days work= 1/18
1/x + 2/3x = 1/18 or x = 30.
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