Well excuse me for thinking that their are smart math geeks here that can do the " Math " blindfolded in a snap; but all of you have proved me dead wrong.
I can't speak for ST or Camerongray but the arithmetic is quite straightforward and it was quite easy to figure out. (I did so as I was somewhat curious myself) I did not share my results as I was not interested in helping you avoid cognitive exercise.
And the answer; the " Math " goes something like this with no excuses posted below .
That is the answer to a different question.
Your question here is, "if one page of text is 64 lines by 73 columns, how many pages will fit in a megabyte". The question you got answered was, "if 300 pages take 10,272K and all pages use the same amount of storage, how many pages will fit in 1MB". These are two different questions, and as it happens, they have two different answers. (And both require different assumptions to be made as well)