document.write( "Question 259649: The class treasury contained $30 in nickels and dimes. If there were 500 coins, how many coins of each. \n" ); document.write( "

Algebra.Com's Answer #191099 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"N%2BD=500\"$
\n" ); document.write( "2. $\"5N%2B10D=3000\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"N=500-D\"$
\n" ); document.write( "Substitute into eq. 2 and solve for D.
\n" ); document.write( "2. $\"5N%2B10D=3000\"$
\n" ); document.write( " $\"5%28500-D%29%2B10D=3000\"$
\n" ); document.write( " $\"2500-5D%2B10D=3000\"$
\n" ); document.write( " $\"5D=500\"$
\n" ); document.write( " $\"D=100\"$
\n" ); document.write( "Now use eq. 1,
\n" ); document.write( " $\"N=500-D\"$
\n" ); document.write( " $\"N=500-100\"$
\n" ); document.write( " $\"N=400\"$
\n" ); document.write( "There are 400 nickels and 100 dimes. \n" ); document.write( "

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