1.  Which one will replace the question mark ?
  

A. 18
B. 24
C. 36
D. 58

Answer: Option B

Explanation:

(7 x 3) = 21 and (9 x 3) = 27

and (4 x 9) = 36 and (2 x 9) = 18

Therefore (9 x 6) = 54 and (4 x 6) = 24.