Question

Kwesi is putting on sunscreen. He uses 3\text{ ml}3 ml3, start text, space, m, l, end text to cover 45 \text{ cm}^245 cm

2
45, start text, space, c, m, end text, squared of his skin. He wants to know how many milliliters of sunscreen (g)(g)left parenthesis, g, right parenthesis he needs to cover 240\text{ cm}^2240 cm
2
240, start text, space, c, m, end text, squared of his skin. He assumes the relationship between milliliters of sunscreen and area is proportional.
How many milliliters of sunscreen does Kwesi need to cover 240 \text{ cm}^2240 cm
2
240, start text, space, c, m, end text, squared of his skin?

Answer 1

16ml

Explanation:

eligible on khan

Answer 2

16 mL

Explanation:

The ratio of areas is (245 cm²)/(45 cm²) = 16/3, so Kwesi expects the ratio of volumes to be the same:

(needed volume)/(3 mL) = 16/3

needed volume = (16/3)×(3 mL) = 16 mL

Kwesi expects to need 16 mL of sunscreen to cover 240 cm² of skin.