In some quantity of ghee, 60% of pure ghee and 40% of is vanaspati. If 10kg of pure ghee is added, then the strength of vanaspati ghee becomes 20%. The original quantity was?
Select:
A) 5kg
B) 10kg
C) 15kg
D) 20kg
E) 25kg
Let the original quantity be x kg   vanaspati ghee in x kg = 40/100 *x = 2x/5 kg   (2x/5)/(x+10) = 20/100   2x/(5x+50) = 1/5   5x = 50   x = 10kg   Answer is 10kg
<result>B</result>
In some quantity of ghee, 60% of pure ghee and 40% of is vanaspati. If 10kg of pure ghee is added, then the strength of vanaspati ghee becomes 20%. The original quantity was?