A can do the work in 18 days and B in 24 days. If they work on it together for 5 days, then find the fraction of the work which is left.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. .
Total work = 72 (LCM of 18 and 24)
Efficiency of A and B = (72/18) + (72/24) = 4 + 3 = 7 units/day
Work done in 5 days = 7 × 5 = 35
Remaining work fraction = (72 - 35)/72 = 37/72
Hence, the fraction of the work that is left is 37/72.