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I am told the answer is 10.

I tried drawing a diagram.

A: B: C:

x x x

25-x 21-x 23-x

23-x 25-x 21-x

63-(x + 21-x + 23-x) 91-(x+25-x+21-x) 44-(x+23-x+21-x)

I added all of these together and had them equal to 198, since I am using values repeatedly. I also omitted the repeats and set the sum to 139. This should give me the correct answer correct?