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Yoku is putting on sunscreen. He uses $2 \mathrm{ml}$ to cover $50 \mathrm{~cm}^{2}$ of his skin. He wants to know how many milliliters of sunscreen $(c)$ he needs to covel $325 \mathrm{~cm}^{2}$ of his skin.$\newline$How many milliliters of sunscreen does Yoku need to cover $325 \mathrm{~cm}^{2}$ of his skin?$\newline$$\square$ $\mathrm{ml}$