document.write( "Question 358951: marty has 30 quarters, dimes and nickels. the total value marty has in coins is $4.50. she has three times as many nickels as dimes. how many of each coin does marty have? \n" ); document.write( "

Algebra.Com's Answer #256132 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"N%2BD%2BQ=30\"$
\n" ); document.write( "2. $\"5N%2B10D%2B25Q=450\"$
\n" ); document.write( "3. $\"N=3D\"$
\n" ); document.write( "Substituting eq. 3 into eq. 1,
\n" ); document.write( " $\"3D%2BD%2BQ=30\"$
\n" ); document.write( "4. $\"4D%2BQ=30\"$
\n" ); document.write( "Substituting eq. 3 into eq. 2,
\n" ); document.write( " $\"5%283D%29%2B10D%2B25Q=450\"$
\n" ); document.write( " $\"25D%2B25Q=450\"$
\n" ); document.write( "5. $\"D%2BQ=18\"$
\n" ); document.write( "Subtract eq. 4 from eq. 5,
\n" ); document.write( " $\"4D%2BQ-D-Q=30-18\"$
\n" ); document.write( " $\"3D=12\"$
\n" ); document.write( " $\"highlight%28D=4%29\"$
\n" ); document.write( "Then from eq. 5,
\n" ); document.write( " $\"4%2BQ=18\"$
\n" ); document.write( " $\"highlight%28Q=14%29\"$
\n" ); document.write( "Then from eq. 3,
\n" ); document.write( " $\"N=3D\"$
\n" ); document.write( " $\"highlight%28N=12%29\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( "12 nickels, 4 dimes, and 14 quarters. \n" ); document.write( "

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