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04-11-2014
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The ratio of the number of mystery books to the number of science fiction books is 4 : 3. The ratio of the number of science fiction books to the number of biographies is 4 : 5. If there are 48 science fiction books, find the total number of books.

Answer :

13-11-2014

   4:3
   Mystery Books:Science Fiction Books(48)

      48 divided by 3 = 16
      16 multiplied by 4= 64
There are 64 Mystery Books.

      4:5
Science Books(48):Biographies

   48 divided by 4 = 12
   12 multiplied by 5 = 60
The are 60 Biographies

Mystery Books 64
Science Fiction books    48
Biographies +60
       ------
   172

I hope that helped!

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