a can do a work in 4days b in 5 days and c in 10 days find the time taken by a, b, &c to do the work togethar
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Work done by A in 4 days = 1/4
Work done by B in 5 days = 1/5
Work done by C in 10 days = 1/10
Work done By (A+B+C) = 1/4 + 1/5 + 1/10
= 5+4+2/20 = 11/20
Time taken by (A+B+C) = 20/11
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