X is twice as good as workman as Y. Together, they finish the work in 18 days. In how many days can it be done by each separately?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. X = 27 days, Y = 54 days
X is twice as good as workman as Y.
Ratio of Efficiency of X and Y = 2 : 1
Total work = Efficiency × Time
Together, they finish the work in 18 days
Total work = 3 × 18 = 54 units
Alone X and Y will take 54/2 = 27 days and 54/1 = 54 days