400-600-1123
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答案：
C
已知条件是
上面那个书架里面的书的页数最多为400页，下面那个书架里面书的页数最少为475页。如果排序的话，肯定是上面的书架都在前，下面的书架都在都在后面。但是具体里面的书怎么排我们不知道。条件一和条件二单独看都判断不出，合起来是，我们可以发现，最中间的那本刚好是在上面书架里的页数最大的那本，即，第25本是400页（后面那本第26本必然有475页）。第25本书前面有24本，后面有24本，所以400就是他们的中位数 
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