document.write( "Question 346013: Jim has $9.00 in dimes and quarters. If he has twice as many quarters as dimes, how many of each coin does he have? \n" ); document.write( "

Algebra.Com's Answer #247437 by Fombitz(32388) $\"\"$ $\"About$

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Let $\"D\"$ be the number of dimes, $\"Q\"$ the number of quarters.
\n" ); document.write( "1. $\"10D%2B25Q=900\"$
\n" ); document.write( "2. $\"Q=2D\"$
\n" ); document.write( "Substitute eq. 2 into eq. 1,
\n" ); document.write( " $\"10D%2B25%282D%29=900\"$
\n" ); document.write( " $\"10D%2B50D=900\"$
\n" ); document.write( " $\"60D=900\"$
\n" ); document.write( " $\"highlight%28D=15%29\"$
\n" ); document.write( "Then from eq. 2,
\n" ); document.write( " $\"Q=2%2815%29\"$
\n" ); document.write( " $\"highlight%28Q=30%29\"$ \n" ); document.write( "

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