document.write( "Question 157197: Delia has 115 books. If she has 4 times as many mystery books as science books, how many mystery books does she have? \n" ); document.write( "
Algebra.Com's Answer #115856 by checkley77(12844)\"\" \"About 
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x+4x=115
\n" ); document.write( "5x=115
\n" ); document.write( "x=115/5
\n" ); document.write( "x=23 the number of science books.
\n" ); document.write( "4*23=92 mystery biooks.
\n" ); document.write( "Proof:
\n" ); document.write( "23+92=115
\n" ); document.write( "115=115
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