1.  Which one will replace the question mark ?
A. 47
B. 45
C. 37
D. 35

Answer: Option C

Explanation:

(3 x 3) + (5 x 6) = 39

and (4 x 4) + (5 x 7) = 51

Therefore, (3 x 4) + (5 x 5) = 37.