i. In some quantity of ghee, 60% is pure ghee and 40% is vanaspati. If 10 kg of pure ghee is added, then the strength of vanaspati ghee becomes 20%. The original quantity was :

- 10 kg
- 15 kg
- 20 kg
- 25 kg

Answer and Explanation

The Correct answer is : 10 kg

Let the original quantity be x kg. Vanaspati ghee in x kg

${\frac{40x}{100}}$kg = ${\frac{2x}{5}}$ kg.

Now, ${(2x/5)/(x + 10)}$ =${\frac{20}{100}}$

=${\frac{2x}{(5x+50)}

\frac{1}{5}}$

5x = 50

x = 10.

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