A Store charfes $0.20 per pound plus a set fee of $2 for ice. How many pounds of ice would somebody have brought if they paid $15

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%)