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The answer is (39 + 153)/2 = 192/2 = 96
It is 153.
153 is a multiple of 3.
In all of math and arithmetic, past and present, there is only one number that equals 153. That number is . . . . . wait for it . . . . . 153 itself.
153 cubed is 3581577. And the sum of one number is itself.