It is 2.5454... recurring.
You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
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Well, that would be true if the first two numbers are in base=11 but the 10 is in base=10. (15)11 = decimal 16 (6)11 = decimal 6 (15)11 - (6)11 = (decimal 16) minus (decimal 6) = decimal 10 (*For the solution to the Poptropica riddle, see the related question below.)
2 over 11 written as a repeating decimal = 0.18181818...
7.54545
11/12 = 0.9166666 ....... recurring 6
0.5454545455 . . .