John is putting on sunscreen. He uses 3 ml to cover 45 square cm of his skin. He wants to know how many milliliters of sunscreen (g) he needs to
cover 240 square cm of his skin. He assumes the relationship between
milliliters of sunscreen and area are proportional. How many milliliters of
sunscreen does John need to cover 240 square cm of his skin? (Only write
in the number.) *