Question

Kwesi is putting on sunscreen. He uses 3\text{ ml}3 ml to cover 45 \text{ cm}^245 cm 2 of his skin. He wants to know how many milliliters of sunscreen (g)(g) he needs to cover 240\text{ cm}^2240 cm 2 of his skin. He assumes the relationship between milliliters of sunscreen and area is proportional.

Answer 1

Explanation:

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Answer 2

Kwesi needs 16 ml or 16 g of sunscreen to cover 240 cm² of his skin.

Explanation:

It is given that Kwesi is putting on sunscreen. He uses 3 ml to cover 45 cm² of his skin.

Let Kwesi needs x ml of sunscreen to cover 240 cm² of his skin.

It is given that relationship between milliliters of sunscreen and area is proportional.

`(3)/(45)=(x)/(240)`

`3* 240=45* x`

`720=45x`

Divide both sides 45.

`16=x`

We know that

`1\text{ ml}=1g`

Therefore Kwesi needs 16 ml or 16 g of sunscreen to cover 240 cm² of his skin.