on monday 72% of the class ordered lunch. which fraction shows the part of the class that ordered lunch?

Yoku is putting on sunscreen. he uses 2\text{ ml}2 ml to cover 50\text{ cm}^250 cm 2 of his skin. he wants to know how many milliliters of sunscreen (c)(c) he needs to cover 325\text{ cm}^2325 cm 2 of his skin. how many milliliters of sunscreen does yoku need to cover 325 \text{ cm}^2325 cm 2 of his skin?

Write a story that matches with the expression 42x-5 pls hurry

Asap! i'm not good math and i'm lost.