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Question

In a soap manufacturing industry, the first purified soap solution can contain 30% impurities. After double purification, it contains 6% impurities. How much of double purified soap can be extracted from 30 kgs of single purified soap?

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Answer- B

On double purifying impurity decreases from 30% to 6%., but the amount of soap in both cases remains constant,

i.e, 94% of double purified soap = 70% of single purified soap.

Let x be the quantity of double purified soap

Then 94*x/100 = 70*30/100, x = 30*70 /94 = 22.34