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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% ?
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- 155 litres
- 150 litres
- 150.4 litres
- 149 litres
Correct Option: B
Glycerine in mixture = 40 litres
Water = 10 litres
Let m litres of pure glycerine is mixed with the mixture.
| ∴ | = | = | |||
| 50 + m | 100 | 20 |
⇒ 800 + 20m = 950 + 19m
⇒ m = 950 – 800 = 150 litres.
