A can do a piece of work in 8 days, B can do it in 10 days and C can do it in 20 days. In how many days can A, B and C together complete the work?

37/11 days
35/11 days
32 /11 days
39/11 days

Correct Answer: 37/11 days

Explanation:

A's 1 days 's work = 1/8
B ' s 1 days ' s = 1/10
C ' s day 's work = 1/20
(A + B + C)'s 1 days 's work = 1/8 + 1/10 + 1/20 = (5 + 4 + 2)/40 = 11/40
∴ (A + B + C ) can finish the work in 40/11 days or 3 ⁷/₁₁ days.

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