Mary mixes white paint and blue paint in the ratio 2:5.
She makes a total of 21 litres of paint.
How much more blue paint does she need to add to the mixture so that
the ratio of white paint to blue paint becomes 1 : 4?

Step-by-step explanation: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:

Mary mixes white paint and blue paint in the ratio 2:5. She makes a total of 21 litres of paint. How much more blue paint does she need to add to the mixture so that the ratio of white paint to blue paint becomes 1 : 4?

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Mary mixes white paint and blue paint in the ratio 2:5.
She makes a total of 21 litres of paint.
How much more blue paint does she need to add to the mixture so that
the ratio of white paint to blue paint becomes 1 : 4?