A and B can separately finish a piece of work in 20 days and 15 days respectively

A and B can separately finish a piece of work in 20 days and 15 days respectively. They worked together for 6 days, after which B was replaced by C. If the work was finished in next 4 days, then the number of days in which C alone could do the work is
(a) 50 days
(b) 30 days
(c) 40 days
(d) 60 days

Anurag Mishra Professor Asked on 25th March 2016 in Maths.
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    Answer: (c) 40 days 

    Anurag Mishra Professor Answered on 26th March 2016.
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