Answer:
2 replaces the question mark.
Explanation:
There are five small squares, each with two horizontal rows. Consider the upper two horizontal cells to form a two-digit number, the lower two cells also form a two-digit number. We have: The top left square has the sum of two two-digit numbers 39 + 16 = 55. The sum of the two numbers in the second square is 47 + 13 = 60. The sum of the two numbers in the third square is 22 + 43 = 65. The sum of the two numbers in the fourth square is 64 + 06 = 70. Notice that the sum of the two two-digit numbers in each square increases by 5, respectively 55; 60; 65; 70. So, the sum of the two numbers in the central square is 75. From that, the number to fill in the question mark is the number 2 (because 43 + 32 = 75).
