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 ) 27 , c ) 87 , d ) 23 , e ) 93
Output (English): a