To work out how many litres of white and blue paint is needed, use the ratio 3:2. To find the specifc ratio for 18 litres, of paint: 2+3=5, 18/5=3.6 so (3:2)*3.6 becomes 10.8:7.2 (check 10.8+7.2=18). So to determine the cost multiply the cost per litre by how many litres were used of each paint: 2.8*10.8+3.5*7.2=30.24+25.2= £55.44

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