A can complete a piece of work in 18 days, and B can do it in 27 days.If they work together, how many days will they take to complete the work?
Show answer & explanation
Correct answer: A
Explanation
A's 1-day work efficiency = 1/18
B's 1-day work efficiency = 1/27
Combined 1-day work efficiency of both = 1/18 + 1/27
= (3 + 2)/54
= 5/54
Therefore, time taken to complete the work = 54/5 = 10.8 days