mary mixes white paint with blue paint in the ratio 2:3. she makes a total of 20 litres of paint. how much more paint will she need to add to the mixture so that the ratio of the white paint to blue paint will be 1:7

Mary has 20 liters of paint mixed white:blue in the ratio 2:3. So two fifths of that paint is white and three fifths is blue. So that's 8 liters white, 12 liters blue.

We want to add paint to get white:blue = 1:7. Clearly we need to add blue. We have our 8 liters of white, so we need a total of 7 (8) = 56 liters of blue. We already have 12, so we have to add 56-12=44 liters of blue paint:

Answer: Add 44 liters blue

44 Litres

That's the answer of what I got