Question

if 1000 copies of a book of 13 sheets require 26 reams of paper, how much paper is required for 5000 copies of a book of 17 sheets.

Answer 1

1000 copies of 13 sheet = 1000 * 13
                                     = 13000 sheets

13000 sheets require 26 reams
1 ream can copy = 13000 / 26
                         = 500 sheets
 ream required to copy 85000 sheets =85000 / 500
                                                      =170 reams