A green made from yellow and blue appears too yellow. What should be done to balance it?

Correct answer: Add a little more blue

Colour mixing explains that green is formed from yellow and blue. When the result appears too yellow, the mixture contains too much yellow relative to blue. Adding a small quantity of blue shifts the balance toward a clearer green. Red would introduce an unwanted opposing component, while white or black changes lightness or dullness rather than correcting the colour ratio.