Final answer:
To mix the new color, use proportions: 123 ounces of red paint are mixed with 212 ounces of white paint. So the total volume of the mixture is 335 ounces. Using proportions, Sheila will make approximately 10.89 ounces of the new color.
Step-by-step explanation:
To mix the new color, we need to use proportions. We know that 123 ounces of red paint are mixed with 212 ounces of white paint. So the total volume of the mixture is 123 + 212 = 335 ounces. Since Sheila uses 4 ounces of red, we can set up a proportion:
123 ounces / 335 ounces = 4 ounces / x ounces
Cross multiplying, we get:
123x = 4 * 335
123x = 1340
Dividing both sides by 123, we find that x = 10.89
Therefore, Sheila will make approximately 10.89 ounces of the new color.