Task: Question Answering
Input (English): Problem: in some quantity of ghee , 60 % of pure ghee and 40 % of is vanaspati . if 10 kg of pure ghee is added , then the strength of vanaspati ghee becomes 20 % . the original quantity was ? 
Options: a ) 5 kg , b ) 10 kg , c ) 15 kg , d ) 20 kg , e ) 25 kg
Output (English): b