Task: Question Answering
Input (English): Problem: the ratio of the two natural numbers is 5 : 6 . if a certain number is added to both the numbers , the ratio becomes 7 : 8 . if the larger number exceeds the smaller number by 10 , find the number added ? 
Options: a ) 17 , b ) 14 , c ) 10 , d ) 16 , e ) 20
Output (English): c