document.write( "Question 1071032: kevin is saving money. he only has $20 dollar bills and $5 dollar bills. he has a total of 25 bills and a total of $410 dollars. how many $5 bills does he have? how many $20 bills does he have? (using substitution) \n" ); document.write( "
Algebra.Com's Answer #685958 by josgarithmetic(39618)\"\" \"About 
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x, how many $5
\n" ); document.write( "y, how many $20\r
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\n" ); document.write( "\n" ); document.write( "\"system%28x%2By=25%2C5x%2B20y=410%29\"\r
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\n" ); document.write( "\n" ); document.write( "Simplify the money equation first.
\n" ); document.write( "\"x%2B4y=82\"\r
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\n" ); document.write( "\n" ); document.write( "Simpler system: \"system%28x%2By=25%2Cx%2B4y=82%29\".
\n" ); document.write( "Do the substitution and solving any way you want. Easiest might be \"x=25-y\" and then \"%2825-y%29%2B4y=82\".
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