Task: Question Answering
Input (English): Problem: 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 ? 
Options: a ) 10 , b ) 15 , c ) 20 , d ) 18 , e ) 22
Output (English): a