Answer:
8 pints
Step-by-step explanation:
The ratio of red to yellow needs to be ...
red : yellow = 75% : 25% = 3 : 1 = 12 : 4
For the 4 pins of yellow paint in the mixer, a total of 12 pints of red paint are needed. There are already 4 pints in the mixer, so ...
8 pints of red paint need to be added.