1.

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

Answer»

15 days



A's 2 day's WORK = 1/20 x 2 = 1/10 .

(A + B + C)'s 1 day's work = 1/20 + 1/30 + 1/60 = 6/60 = 1/10.

Work DONE in 3 days = 1/10 + 1/10 = 1/5 .

Now, 1/5 work is done in 3 days.

Whole work will be done in (3 x 5) = 15 days.



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