A and B can complete a task in 12 days and 18 days respectively. They begin the work together, but B leaves after 4 days. How many more days will A take to finish the remaining work?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. days.
LCM(12, 18) = 36
The efficiency of A = 36/12 = 3 units
The efficiency of B = 36/18 = 2 units
Work done by both in 4 days = 4 × (3 + 2) = 4 × 5 = 20 units
Remaining work = 36 - 30 = 16 units
Time taken by A to complete the remaining work = days