A can paint a house in 55 days and B can do it in 66 days. Along with C, they did the job in 12 days only. Then, C alone can do the job in how many days?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 20
Let the total amount of work be 660 units
Efficiancy of (A + B + C) = 55 units/day
Efficiancy of C = 55 - 12 - 10 = 33 units/day
Time taken by C to complete the work = 66/33 = 20 days