We were told that Nora mixed 5 parts of blue and 3 parts yellow to make green. The ratio of blue paint to yellow paint in the mixture(green paint) is 5 : 3
The sum of the ratio is 5 + 3 = 8
Given that 72 ounces of green paint was produced,
the number of ounces of yellow paint used would be
3/8 * 72 = 27 ounces
the number of ounces of blue paint used would be
5/8 * 72 = 45 ounces