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 50 days to complete the same work. then Q alone can do it in  Pick one
A) 30 days  B) 25 days  C) 20 days  D) 15 days  E) 10days
Explanation :   Work done by P and Q in 1 day = 1/10   Work done by R in 1 day = 1/50   Work done by P, Q and R in 1 day = 1/10 + 1/50 = 6/50   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 × 2 = 6/50   =&gt; Work done by P in 1 day = 3/50   =&gt; Work done by Q and R in 1 day = 3/50   Hence work done by Q in 1 day = 3/50 – 1/50 = 2/50 = 1/25   So Q alone can do the work in 25 days   Answer : Option 25 days
<result>B</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 50 days to complete the same work. then Q alone can do it in