A page of ordinary Roman alphabetic text takes about 2 kilobytes to store (about one byte per letter). So, if I have a 150 page document, how many kilobytes is the document?

There are 300 kilobytes for  150 page documents

Explanation:

Given: A page of ordinary Roman alphabetic text takes about 2 kilobytes to store.

i.e. 1 page takes = 2 kilobytes to store.

So, 150 page document takes = 150 x 2 kilobytes  = 300 kilobytes to store

i.e.  150 page document takes 300 kilobytes to store.

Hence, there are 300 kilobytes for 150 page documents.

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