Task: Question Answering
Input (English): Problem: at present the ratio between the ages of arun and deepak is 4 : 3 . after 6 years , arun ' s age will be 26 years . what is the age of deepak at present ? 
Options: a ) 15 , b ) 21 , c ) 23 , d ) 12 , e ) 25
Output (English): a