A sample of 50 litres of glycerine is found to be adulterated to the extent of 20%. How much pure glycerine should be added to it so as to bring down the percentage of impurity to 5% ?
A. 155 litres
B. 150 litres
C. 150.4 litres
D. 140 litres
Answer: Option B
Solution(By Examveda Team)
Give the amount of solution = 50litres20% of impurity in a given solution
i.e.
40 liters of glycerine and 10 liters of impurities
Now to keep the impurity 10 liters and we added glycerine to a solution to bring down impurities level 5%.
i.e. 10 is 5% of 200. So we need to added glycerine 'x' amount of glycerine to make solution of 200liters
∴ x = 200 - (40 + 10) = 150 litres of glycerine
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