Question

Kwesi is putting on sunscreen. He uses 3ml to cover 45 cm2 ​​ of his skin. He wants to know how many milliliters of sunscreen g he needs to cover 240 cm2 ​​of his skin. He assumes the relationship between milliliters of sunscreen and area is proportional.

Answer 1

Answer:

The answer is $16\ ml$

Step-by-step explanation:

we know that

He uses $3\ ml$ to cover $45\ cm^{2}$ ​​ of his skin

so

by proportion

Find how many milliliters of sunscreen are needed to cover  $240\ cm^{2}$

$\frac{3}{45}\frac{ml}{cm^{2}} =\frac{x}{240}\frac{ml}{cm^{2}} \\ \\x=240*3/45\\ \\ x= 16\ ml$

Answer 2

16 ml. If you set 3/45 = x/240 where x is the amount he needs for 240ml^2, then cross multiply and divide to find x you get 16