Task: Question Answering
Input (English): Problem: a + 2 b = 6 , ab = 4 2 / a + 1 / b = ? 
Options: a ) 3 / 2 , b ) 5 / 2 , c ) 7 / 2 , d ) 9 / 2 , e ) 11 / 2
Output (English): a