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white paint costs £2.80 per litre. blue paint costs £3.50 per litre. white paint and blue paint are mixed in the ratio 3:2. work out the cost of 18 litres of the mixture

Respuesta :

tclarke
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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