document.write( "Question 61059: Anna has 12 bills in her wallet, some $5 and some $10. The total value of the bills is $100. How many of each bill does Anna have? \n" ); document.write( "
Algebra.Com's Answer #41970 by josmiceli(19441)\"\" \"About 
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n = number of $5's
\n" ); document.write( "m = number of $10's
\n" ); document.write( "n + m = 12
\n" ); document.write( "5n + 10m = 100
\n" ); document.write( "5n + 10(12 - n) = 100
\n" ); document.write( "5n + 120 - 10n = 100
\n" ); document.write( "5n = 20
\n" ); document.write( "n = 4
\n" ); document.write( "m = 12 - n
\n" ); document.write( "m = 8
\n" ); document.write( "check
\n" ); document.write( "5*4 + 10*8 = 100
\n" ); document.write( "20 + 80 = 100
\n" ); document.write( "OK
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