Kato must write 60 percent of a 20- page report by tommorow. Kato wants to determine the number of pages that he needs to write by Tommorow. Katos work is shown below

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%)