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11-05-2017
Mathematics

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White paint cost £2.80 a litre.
Blue paint cost £3.50 a litre.
White and blue paint are mixed in the ratio 3:2.
How much is the cost of 5 litres if the mixture?

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rekrekrek rekrekrek

11-05-2017

There are five parts to the ratio:
18 ÷ 5 is 3.6.
Therefore you need 10.8l of white paint and 7.2l of blue paint.

10.8l * 2.80 = £30.24
7.2l * 3.50 = £25.20

The total is £55.44

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