Task: Question Answering
Input (English): Problem: tough and tricky questions : exponents . if 7 ^ ( 3 x - 1 ) * 3 ^ ( 4 y - 3 ) = 49 ^ x * 27 ^ y , then x + y = 
Options: a ) 3 , b ) 4 , c ) 2 , d ) 1 , e ) 5
Output (English): b