X does a work in 6 days, while Y does it in 12 days. If they work alternatively and X begins, in how many days will the work be finished?
Answer & explanation
Correct answer: option 3
X = 6 days, Y = 12 days,
⇒ They work alternatively, starting with X,
1st day = 2
2nd day = 1
Every 2 days = 3 units
So,in 8 days, 12 units of work will be completed.
Therefore, work will be completed in 8 days.