A single refined oil can contains 20% impurities. After double–refining, it contains 4% impurities. How much of double-refined oil can be obtained from 30 litres of single refined oil?
Correct answer: C
Explanation
On double-refining impurity decreases from 20% to 4%, but the amount of pure oil in both cases remains constant,
i.e, 96% of double refined oil = 80% of single refined oil.
Let x be the quantity of double-refined oil
Then 96*x/100 = 80*30/100, x = 30*80 /96 = 25
C
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