Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5:2:3.
How much of each juice is needed to make 25 liters of this punch?
I got 12.5L for pear, 5L for pineapple, and 7.5L for plum. These were all right. Now, I have the second part I need help with:

How much punch can she make if she has only 6 cups of plum juice?