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30 September, 20:22

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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  1. 30 September, 20:42
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    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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