A can do a piece of work in 10 days, while B can do it in 6 days. B worked at it for 4 days. How long will A take to finish the remaining work?

31/3 days
32/3 days
32/5 days
35/7

Correct Answer: 31/3 days

Explanation:

B's 4 days work = (1/6) x 4 = 2/3
∴ Remaining work = 1 - (2/3) = 1/3
A's 1 day's work = 1/10
∴ 1/3 work is finished by A in
(10 x 1/3) = 3¹/₃ days

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