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Missing Pages (Posted on 2009-11-13) Difficulty: 2 of 5
A chunk of pages is missing from a book. The sum of the missing page numbers is 9808. What are those page numbers?

See The Solution Submitted by Brian Smith    
Rating: 3.5000 (2 votes)

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Solution Easy, Virginia Comment 7 of 7 |

a1 ==> first page   - odd number
ak ==> last page   even
av=average= 1/2* (a1+ak )= odd number of halves

9808=16*613=32*306.5

There are 32  page  numbers missing (16  sheets),:

a1=306-15=291

ak=307+15=322


  Posted by Ady TZIDON on 2009-11-14 02:48:24
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