The center of the third figure is empty. What digit should fit inside?
The pattern that is being followed here is reversing the corner digits and adding them.
First Square:
13 + 32 + 11 + 34 = 90
Second Square:
21 + 19 + 27 + 16 = 83
Third Square:
33 + 33 + 22 + 26 = 125
Thus the missing number is 125
