How do you reduce 42/70- math

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?

Solve this and show you’re work step by step ! -5 3/4+3h< 9 1/4 -

X+ y = 5 ; x - y =3 solve using linear combination