Unfortunately, the browser used for posting questions is absolute crap: it rejects most mathematical symbol. As a result we cannot see the operator between 5.5 and .56 and so cannot make out what the question is. Perhaps you can re-submit using word instead of mathematical symbols. Also, you make a complaint: we have raised the matter with no success.
56 - 55 = 1
56
47 is the average of 55, 56 and 30.
(56/55) / (77/40) = (56/55) * (40/77) =56*40/(55*77) = 8*40/(55*11) = 8*8/(11*11) = 64/121
56/55 is already in its simplest form
55 + 1 = 5654 + 2 = 5653 + 3 = 56...10 + 46 = 569 + 47 = 568 + 48 = 56...1 + 55 = 56
-55
56
7/56 + 48/56 = 55/56
55 + 5/5 = 56
55.143
55 is between the integers 54 and 56