Question

Paint is red : blue in a ratio of 2 : 4. If 5 litres of red is used how much blue is used

Answer 1

so since the ratio of red paint to blue paint is 2:4 and you can simplify 2:4 into 1:2 and because 5 liters of paint is used you would have to multiply the 2 from the simplified ratio by 5 so you could get the answer  2*5 and that equals 10