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<u>Given:</u>
Ratio of white and blue paint is 2:3
Total quantity of paint is 20 litres
<u>To find:</u>
Quantity of blue paint to be mixed so that the ratio of white paint to blue paint becomes 1:7
<u>Solution:</u>
The ratio 2:3 totals 20 that is
So, the quantity of white paint in the mixture is and the quantity of blue paint in the mixture is
Now, to get the final ratio as 1:7, Mary should have of blue paint. So, she need to add
.
Therefore, Mary has to add 44 litres of blue paint to the mixture to make the ratio as 1:7.