Working together, Jack and Perla can finish polishing a furniture in 12 days. Jack can do 2 times as much as Perla can. How long will it take Jack to finish the job alone? How about Perla?

Answer:

Let's call Jack's work per day X hours and Perla's per day Y hours.

In that case, we can create the equation X = 2Y since Jack can get twice as much work done as Perla in the same time period.

We can now solve for X by dividing both sides by 2 to get X = Y/2.

Finally, we can substitute this into our original equation to find that Jack working alone would take 12/Y days to finish the job

Therefore, It would take Jack 6 days to finish the job alone while Perla would take 24 days to finish the job by herself.