document.write( "Question 342507: i have 18 coins that add up to $ 3.30 and all i had was quarters and dimes how many quarters did i have and how many dimes \n" ); document.write( "
Algebra.Com's Answer #245195 by Edwin McCravy(20086)\"\" \"About 
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document.write( "  q +   d =  18\r\n" );
document.write( "25q + 10d = 330\r\n" );
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document.write( "Divide the 2nd equation through by 5\r\n" );
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document.write( " q +  d = 18\r\n" );
document.write( "5q + 2d = 66\r\n" );
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document.write( "Solve the first equation for d\r\n" );
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document.write( "d = 18 - q\r\n" );
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document.write( "Substitute (18 - q) for d\r\n" );
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document.write( "5q + 2(18 - q) = 66\r\n" );
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document.write( "5q + 36 - 2q = 66\r\n" );
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document.write( "3q = 30\r\n" );
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document.write( " q = 10\r\n" );
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document.write( "Substitute in d = 18 - q\r\n" );
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document.write( "d = 18 - q = 18 - 10 = 8\r\n" );
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document.write( "10 quarters and 8 dimes\r\n" );
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document.write( "Edwin
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