I guess I should explain I'm doing 4 rows of color. The bottom being the most creamy yellow and working on lighter as I go up.

For the yellow, to divide 128 ounces of paint into four buckets, add up the percentages: 100 + 75 + 50 + 25 to get 250 and divide that by the amount of paint, 128 oz. and you get 0.5 oz as your multiplier. So multiple 0.5 by the percentage in each can:

Going from bottom to top in yellow:
1. 100 x .5 = 50 oz
2. 75 x .5 = 37.5 oz
3. 50 x .5 = 25 oz
4. 25 x .5 = 12.5 oz

Going from bottom to top in white, fill each can to 50 oz:

1. zero white paint
   2. 12.5 oz
   3. 25 oz
   4. 37.5 oz

thank you, I wonder why it doesn't add up to 128oz. When I add it, it comes to 125oz.

When I divided 128 by 250, I rounded the number to 0.5 oz. You can redo the math with more precision and properly allot the extra 3 ounces of yellow paint to the four buckets.