document.write( "Question 997433: Teresa has
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Algebra.Com's Answer #807685 by CubeyThePenguin(3113)\"\" \"About 
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n = number of nickels
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\n" ); document.write( "\n" ); document.write( "5n + 10d = 600
\n" ); document.write( "n = 4d\r
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\n" ); document.write( "\n" ); document.write( "Substitute the second equation into the first.\r
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\n" ); document.write( "\n" ); document.write( "5(4d) + 10d = 600
\n" ); document.write( "20d + 10d = 600
\n" ); document.write( "30d = 600
\n" ); document.write( "d = 20\r
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\n" ); document.write( "\n" ); document.write( "There are 20 dimes and 80 nickels.
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