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29 March, 17:24

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.

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  1. 29 March, 21:03
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    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
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