Amy mixed 4 cups of red paint with 1 cup of white paint to make pink paint. She ran out of pink paint and had to mix more paint. How much white paint should she add to one cup of red paint to make the same pink paint?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)