One gallon of Wet & Forget can be mixed with water to make 6 gallons of the mixture. But the sprayer only holds 4 gallons. How much Wet & Forget concentrate and how much water does Kathy need to fill the sprayer with 4 gallons of mixture? Use ratios to solve this problem:

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%)