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% ?
Options:
A . 149 litres
B . 155 litres
C . 150 litres
D . 150.4 litres
Answer: Option C Answer: (c)Glycerine in mixture = 40 litresWater = 10 litresLet x litres of pure glycerine is mixed with the mixture. ${40 + x}/{50 + x} = 95/100 = 19/20$800 + 20x = 950 + 19xx = 950 – 800 = 150 litres.
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