You can put this solution on YOUR website! if 543 - 255=244 are all in base x so find x
255 + 244 = 543
5 + 4 = 9
9 modulo base = 3
--> base = 6
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255 base 6 = 2*36 + 5*6 + 5 = 107
244 base 6 = 2*36 + 4*6 + 4 = 100
543 base 6 = 5*36 + 4*6 + 3 = 207