A can complete a piece of work in 12 days, and B in 16 days. They work together for 3 days. How much work remains?
Show answer & explanation
Correct answer: B
Explanation
Work done in 1 day = 1/12 + 1/16
1/12 + 1/16 = (4 + 3)/48 = 7/48
Work done in 3 days = 3 × 7/48 = 21/48 = 7/16
Remaining work = 1 − 7/16 = 9/16