A can do a work in 6 days and B in 9 days. They work together for 3 days. What part of the work is left?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. .
Work done by A in 1 day = 1/6
Work done by B in 1 day = 1/9
Work done together in 1 day = 1/6 + 1/9 = 5/18
Work done together in 3 days = 3 × 5/18 = 5/6
Remaining work = 1 - 5/6 = 1/6