Question

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

Answer 1

Yoku would need 13 ml of sunscreen to cover 325 cm² of his skin.

Yoku is using 2 ml of sunscreen to cover 50 cm² of his skin. To find out how many milliliters of sunscreen he needs to cover 325 cm² of his skin, we can use the formula:

`\[ \text{Amount of sunscreen (ml)} = \frac{A_{\text{to be covered}} * \text{Amount of sunscreen (ml)}}{A_{\text{covered}}} \]`

Substituting the given values and the desired area (325 cm²), we get:

`[\text{Amount of sunscreen (ml)}] = \frac{325 \text{ cm²} * 2 \text{ ml}}{50 \text{ cm²}}`

Simplifying the equation, we get:

`[\text{Amount of sunscreen (ml)}] = \frac{650 \text{ cm²}}{50 \text{ cm²}} * 2 \text{ ml}`

`[\text{Amount of sunscreen (ml)}] = 13 \text{ ml}`

Therefore, Yoku would need 13 ml of sunscreen to cover 325 cm² of his skin.