A person can do a piece of work in 18 days. After working for 12 days, the person leaves and another person joins and completes the remaining work in 8 days. In how many days can the second person complete the whole job?

A20

B24 ✓ Correct

C22

D18

Correct answer: (B) 24

Explanation

The second person alone takes 24 days.

First does 1/18 per day; in 12 days = 12/18 = 2/3.

Remaining work = 1/3.

Second does 1/3 in 8 days.

Full job = 8 x 3 = 24 days.

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