you can do a piece of work in 8 days, B can do it in 16,While

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you can do a piece of work in 8 days, B can do it in 16,While C can do it in 80 days. In how many days they can complete the whole work, working together?

1. 5
2. 6
3. 8 2/3
4. 20 2/5

Correct Option: A

Efficiency of A = 12.5%
Efficiency of B = 6.25%
Efficiency of C = 1.25%

Efficiency of (A+ B + C) = (12.5 +6.25 + 1.25) = 20%
Required no of days = 100/20 = 5 days