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?

Question

anonymous · Answer

you solve this by finding out what is the percent of books are in the library

anonymous · Answer

if 55 percent gone, than 45% remains  (subtract from 100%)

anonymous · Answer

Wouldn't it be 5 books?

anonymous · Answer

read your question...they have 9 books there so they HAVE to have more in total

anonymous · Answer

55%

anonymous · Answer

so 9/.45 = 20

they have 20 books total

anonymous · Answer

so lets check...55% are checked out
so 20* .55 = 11

that would leave 9 in the library (20-11 = 9)

did you follow?

anonymous · Answer

So 9 - 20?

anonymous · Answer

Which is 11?

anonymous · Answer

Oh yeah... Ok know i get it!!! Thanks so much! :D

anonymous · Answer

You are more than welcome...