Central Police Officers Recruitment Exam

Q. A and B can do a piece of work in 30 days while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work?

(1) 18 days                       (2) 24 days
(3) 30 days                      (4) 36 days 

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