P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 15 days to complete the same work. then Q alone can do it in
Choose the correct choice from the following answers
A) 20
B) 22
C) 25
D) 27
E) 60
Work done by P and Q in 1 day = 1/10   Work done by R in 1 day = 1/15   Work done by P, Q and R in 1 day = 1/10 + 1/15= 1/6   But Work done by P in 1 day = Work done by Q and R in 1 day . Hence the above equation can be written as Work done by P in 1 day Ã— 2 = 1/6   =&gt; Work done by P in 1 day = 1/12   =&gt; Work done by Q and R in 1 day = 1/12   Hence work done by Q in 1 day = 1/12 â€“ 1/15 = 1/60   So Q alone can do the work in 60 days   Answer is 60.
<result>E</result>
P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 15 days to complete the same work. then Q alone can do it in