Question
150 litres of a mixture (paint + oil) contains 20% oil.
How much oil should be added to make the ratio of paint to oil 5:3?Solution
Let the quantity of oil to be mixed be ‘x’ litres
According to the question,
(0.80 × 150)/(0.20 × 150 + x) = 5/3
120/(30 + x) = 5/3
Or, 5(30 + x) = 360
Or, 150 + 5x = 360
Or, 5x = 210 ⇒ x = 42
Therefore, quantity of oil to be mixed = 42 litres
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