Sarah can take no more than 22 pounds of luggage on a trip for suitcase weighs 112 ounces how many more pounds can she pack without going over the limit

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%)