Arecipe calls for 6 cups of water and 4 cups of flour.
a) what is the ratio of water to flour
b) if the recipe is increased to use 6 cups of flour, how much water should be used
c) if the recipe is decreased to use 2 cups of water, how much flour should be used

need asap

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%)