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Review: Algebraic Manipulation of a Median
Explanation
M is the median
of a set of consecutive numbers and it's also a member, so we know the number
of elements in this set is odd. Half the numbers are above and half below,
except for the one in the middle. So (A) looks right. We can test with a case.
Say our set is 7, 8, 9, 10, 11, which is a set of 5 integers, so C=5 and M=9. Indeed, we want to subtract 
from 9 to get 7. We can also see from this
case that the other answer choices are incorrect.
The correct answer is (A).
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