In some quantity of ghee, 50% is pure ghee and 50% is vanaspati. If 20kg of pure ghee is added, then the strength of vanaspati ghee becomes 30%. The original quantity was?
Choose the correct option.
A) 25
B) 15
C) 30
D) 45
E) 20
Let the original quantity be x   then, vanaspati ghee in xkg = 50x/100 kg= x/2kg   (x/2)/(x+20) = 30/100   x/(2x+40) = 3/10   x = 30   Answer is 30
<result>C</result>
In some quantity of ghee, 50% is pure ghee and 50% is vanaspati. If 20kg of pure ghee is added, then the strength of vanaspati ghee becomes 30%. The original quantity was?