A and B working alone can complete a work in 8 days and 12 days respectively. They started working together, but A left 2 days before completion of the work. In how many days was the work completed
Explanation:
Let the work be completed in ‘d’ days.
⇒ B worked for d days while A worked for (d – 2) days.
∴ Total work done = Work done by A + Work done by B
⇒ 1 = 1/8 × (d - 2) + 1/12 × d
⇒ 24 = 3(d - 2) + 2d
⇒ 30 = 5d
⇒ d = 6 days.
Hence, option (a).
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