A, B and C together can complete a work in 12 days. A as well as B alone can do the same work in 36 days. In how many days can C alone complete the same work?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 36.
Total work = 36 units (LCM of 12 and 36)
Efficiency of A and B = 36/36 = 1 unit/day
Efficiency of A, B, and C = 36/12 = 3 units/day
Efficiency of C = 3 - 1 - 1 = 2 unit/day
Time required for C = 36/1 = 18 days