Task: Question Answering
Input (English): Problem: if 4 xz + yw = 4 and xw + yz = 8 , what is the value of the expression ( 2 x + y ) ( 2 z + w ) ? 
Options: a ) 22 , b ) 20 , c ) 24 , d ) 26 , e ) 28
Output (English): b