+0  
 
0
175
1
avatar

Hiram's algebra notes are 50 pages long and are printed on 25 sheets of paper; the first sheet contains pages 1 and 2, the second sheet contains pages 3 and 4, and so on. One day he leaves his notes on the table before leaving for lunch, and his roommate decides to borrow some pages from the middle of the notes. When Hiram comes back, he discovers that his roommate has taken a consecutive set of sheets from the notes and that the average (mean) of the page numbers on all remaining sheets is exactly 19. How many sheets were borrowed?
 

 Feb 5, 2021
 #1
avatar+118470 
+1

Each sheet  contains  2 pages

 

So...let x  be  the  number of sheets  that  were "borrowed"

 

So.....the  number of pages that remain = 50 - 2x

 

Taking the average of these  remaining  pages = 19  ......so....

 

( 50  - 2x )   / 2   =  19

 

50 - 2x   = 38

 

50  - 38   = 2x

 

12  = 2x

 

x  =  6  sheets were "borrowed"

 

 

cool cool cool

 Feb 5, 2021

12 Online Users