Given set : 538, 725, 813

Answer: D. 219
In all the numbers, (1st digit + 3rd digit) - middle digit = 10
Thus, 5 + 8 - 3 = 10, 7 + 5 - 2 = 10, 8 + 3 - 1 = 10.
Posted in:  Number Analogy -  Analogy -  Verbal Reasoning