Yoku is putting on sunscreen. He uses 2 ml to cover 50cm^2 of his skin. He wants to know how many milliliters of sunscreen(c)e needs to cover 325m^2 cm of his skin. How many milliliters of sunscreen does Yoku need to cover 325cm^2 of his skin?

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%)