Task: Question Answering
Input (English): Problem: if a : b = 4 : 1 , then find ( a - 3 b ) / ( 2 a - b ) ? 
Options: a ) 6 / 7 , b ) 1 / 7 , c ) 5 / 7 , d ) 3 / 2 , e ) 4 / 7
Output (English): b