Tom K. answered 08/27/21
Knowledgeable and Friendly Math and Statistics Tutor
Mahmut gave the standard answer. I will give a fun alternative.
Picture a seesaw. We have 10 at 20 3 to the right of 17 so how much do we need 2 to the lef?
Since the intervals are in the ratio 2:3, the juice is in the ratio 3:2
3/2 * 10 = 15.