document.write( "Question 899299: Samantha has 30 coins, consisting of quarters and dimes, which in total $5.70. How much of each does she have? \n" ); document.write( "

Algebra.Com's Answer #545349 by Fombitz(32388) $\"\"$ $\"About$

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Number of Coins
\n" ); document.write( " $\"Q%2BD=30\"$
\n" ); document.write( "Total Value
\n" ); document.write( " $\"25Q%2B10D=570\"$
\n" ); document.write( "From the first equation,
\n" ); document.write( " $\"Q=30-D\"$
\n" ); document.write( "Substitute,
\n" ); document.write( " $\"25%2830-D%29%2B10D=570\"$
\n" ); document.write( " $\"750-25D%2B10D=570\"$
\n" ); document.write( " $\"-15D=-180\"$
\n" ); document.write( " $\"D=12\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"Q%2B12=30\"$
\n" ); document.write( " $\"Q=18\"$ \r
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