Task: Question Answering
Input (English): Problem: there are 2 friends peter and paul . peter age is twice as old as paul when peter was as old as paul is now . sum of the present ages of peter and paul is 35 . what is the present age of peter ? 
Options: a ) 10 , b ) 15 , c ) 20 , d ) 25 , e ) 30
Output (English): c