Question
Out of 180 litres of paint mixture, the ratio of red to
blue paint is 5:4. What quantity of red paint should be added to make the ratio 7:5?Solution
ATQ,
Red paint = (5/9) × 180 = 100 litres
Blue paint = (4/9) × 180 = 80 litres
Let red paint added = x litres
Then, (100 + x) : 80 = 7 : 5
So, 100 + x = (7/5) × 80 = 112
x = 112 - 100 = 12 litres
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