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 :
Correct Answer: Option A
Let the original quantity be x kg. Vanaspati ghee in x kg = (40x \(\div\) 100 )kg = (2x \(\div\) 5) kg.
Now, (2x \(\div\) 5) \(\div\) (x + 10) = 20 \(\div\) 100
=> 2x \(\div\) (5x + 50) = 1 \(\div\) 5
=> 5x = 50
=> x = 10.
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