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A can do a job in 20 days, B in 30 days and C in 60 days. lf A is helped on every 3rd day by B and C, in how many days will the task be completed?
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Explanation:
A works alone for 2 days and finishes 2\20 or 1\10th of the work.
On the 3rd day A, B and C finish 1\20+1\30+1\60=1\10th of the work.
or in 3 days, 1\10+1\10=1\5th of the work is completed.
Therefore, the job will be completed in 5×3 = 15 days.