document.write( "Question 106802: Tickets for a play at the community theater cost $20 for an adult and $4 for a child. If 140 tickets were sold and the total receipts were $2160, how many of each type of ticket were sold?\r
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Algebra.Com's Answer #77768 by elima(1433)\"\" \"About 
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Tickets for a play at the community theater cost $20 for an adult and $4 for a child. If 140 tickets were sold and the total receipts were $2160, how many of each type of ticket were sold?
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\n" ); document.write( "x=adult tickets
\n" ); document.write( "y=child tickets
\n" ); document.write( "x+y=140
\n" ); document.write( "20x+4y=2160
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\n" ); document.write( "x=140-y
\n" ); document.write( "20(140-y)+4y=2160
\n" ); document.write( "2800-20y+4y=2160
\n" ); document.write( "-16y=-640
\n" ); document.write( "y=40
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\n" ); document.write( "x+40=140
\n" ); document.write( "x=140-40
\n" ); document.write( "x=100
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\n" ); document.write( "so the were 100 adult tickets and 40 child tickets sold
\n" ); document.write( ":)
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