Working alone A,B,C can do a piece of work in 11,20 and 55 days respectively.mhow soon can work be done if A is assisted by B and C on alternate days
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Work done by A in 1 day = 1/11
Work done by B in 1 day = 1/20
Work done by C in 1 day = 1/55
Work done in 1st day = 1/11+1/20 = 31/220
Work done in 2nd day = 1/11+1/55=6/55
Work done in every two days = 31/220+6/55=1/4
Work done in 8 days =4×1/4=1
i.e., 8 days are required. ANS
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A's work in one day = 1/11
B 's work 's in one day = 1/20
C 's work in one day = 1/55
first day work= 1/11+1/20=31/220
second day work= 1/11+1/55=6/55
every two days work = 31/220+6/55=1/4
in 8 days work=4×1/4=1
8 days ans
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