In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
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Question: Problem: if 4 xz + yw = 3 and xw + yz = 6 , what is the value of the expression ( 2 x + y ) ( 2 z + w ) ?
Options: a ) 9 . , b ) 12 . , c ) 15 . , d ) 16 , e ) 18 .

Answer: c

Question: Problem: lilly has 10 fish and rosy has 12 fish . in total , how many fish do they have in all ?
Options: a ) 18 , b ) 20 , c ) 22 , d ) 24 , e ) 26

Answer: c

Question: Problem: the average of first 12 even numbers is ?
Options: a ) 19 , b ) 18 , c ) 16 , d ) 13 , e ) 17

Answer:
d