Task: Question Answering
Input (English): Problem: at present the ratio between the ages of arun and deepak is 2 : 5 . after 10 years arun ' s age will be 30 years . what is the age of the deepak ? 
Options: a ) 20 , b ) 40 , c ) 50 , d ) 60 , e ) 45
Output (English): c