document.write( "Question 71758: Stefan has 42 coins in his collection. The coins consist of nickels, dimes, and quarters. He has twice as many quarters as dimes. Although the collection has been appraised at $1200, the coins' face value is $6.60. How many of each type of coin does he have? \n" ); document.write( "
Algebra.Com's Answer #51305 by checkley75(3666)\"\" \"About 
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N+D+Q=42
\n" ); document.write( "Q=2D
\n" ); document.write( "5N+10D+25Q=660
\n" ); document.write( "N+D+2D=42
\n" ); document.write( "N+3D=42
\n" ); document.write( "N=42-3D SO
\n" ); document.write( "5(42-3D)+10D+25(2D)=660
\n" ); document.write( "210-15D+10D+50D=660
\n" ); document.write( "45D=660-210
\n" ); document.write( "45D=450
\n" ); document.write( "D=450/45
\n" ); document.write( "D=10 ANSWER NUMBER OF DIMES
\n" ); document.write( "Q=2*10=20 ANSWER NUMBER OF QUARTERS
\n" ); document.write( "N+10+20=42
\n" ); document.write( "N=42-30
\n" ); document.write( "N=12 ANSWER NUMBER OF NICKELS
\n" ); document.write( "PROOF
\n" ); document.write( "5*12+10*10+25*20=660
\n" ); document.write( "60+100+500=660
\n" ); document.write( "660=660
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