document.write( "Question 653113: Toni’s piggy bank contains $19.20, made up of 10-cent pieces and 20-cent pieces. If
\n" ); document.write( "There are 114 coins in the piggy bank, how many coins of each denomination are there?
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Algebra.Com's Answer #408267 by checkley79(3341)\"\" \"About 
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Let X be the number of 10 cent pieces.
\n" ); document.write( "Let y be the number of 20 cent pieces.
\n" ); document.write( "X+Y=114
\n" ); document.write( "X=114-Y
\n" ); document.write( ".10(114-Y)+.20Y=19.20
\n" ); document.write( "11.4-.10Y+.20Y=19.20
\n" ); document.write( ".10Y=19.20-11.40
\n" ); document.write( ".10Y=7.80
\n" ); document.write( "Y=7.80/.10
\n" ); document.write( "Y=78 NUMBER OF 20 CENT PIECES.
\n" ); document.write( "114-78=36 NUMBER OF 10 CENT PIECES.
\n" ); document.write( "PROOF:
\n" ); document.write( ".10*36+.20*78=19.20
\n" ); document.write( "3.60+15.60=19.20
\n" ); document.write( "19.20=19.20
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