A can finish a work in 20 days and B can complete the same work in 15 days. B worked for 9 days and left the job. In how many days can A alone finish the remaining work?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 8 days.
A can finish a work in 20 days and B can complete the same work in 15 days
L.C.M(20 and 15) = 60
The efficiency of A = 60/20 = 3 units
The efficiency of B = 60/15 = 4 units
B worked for 9 days = 4 × 9 = 36 units
Remaining work = 60 - 36 = 24
Time taken by A = 24/3 = 8 days