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At the library, you find 9 books on a certain topic. The librarian tells you that 55% of the books on this topic have been signed out. How many books does the library have on this topic?

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you solve this by finding out what is the percent of books are in the library
if 55 percent gone, than 45% remains (subtract from 100%)
Wouldn't it be 5 books?

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Other answers:

read your question...they have 9 books there so they HAVE to have more in total
so 9/.45 = 20 they have 20 books total
so lets check...55% are checked out so 20* .55 = 11 that would leave 9 in the library (20-11 = 9) did you follow?
So 9 - 20?
Which is 11?
Oh yeah... Ok know i get it!!! Thanks so much! :D
You are more than welcome...

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