A,B and C can do a piece of work in 21 days,42 days and 14 days respectively. A started the work. B joined him after 3 days. If C joined them after 5

days, for how many days did A work?

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A,B and C can do a piece of work in 21 days,42 days and 14 days respectively. A started the work. B joined him after 3 days. If C joined them after 5

days, for how many days did A work?

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now B joined and the accuracy became 1/21+1/42=3/42. smilarly a worked with b for 5 days . and with C, A worked for 8 days .

the total days A worked = 22 days