document.write( "Question 86218: Tickets for an event cost $4 for children, $12 for adults, and $ 7 for senior citizens. The total ticket sales were $ 1920. There wee 50 more adult tickets sold than child tickets, and the number of senior citizen tickets wre 4 time the number of child tickets. How many of each ticket were sold. \n" ); document.write( "
Algebra.Com's Answer #62326 by ankor@dixie-net.com(22740)\"\" \"About 
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Tickets for an event cost $4 for children, $12 for adults, and $ 7 for senior citizens. The total ticket sales were $ 1920. There were 50 more adult tickets sold than child tickets, and the number of senior citizen tickets were 4 times the number of child tickets. How many of each ticket were sold.
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\n" ); document.write( "Let a = number of adult tickets sold
\n" ); document.write( "Let s = number of senior tickets sold
\n" ); document.write( "Let c = number of children's tickets
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\n" ); document.write( "Translate each statement to an equation:
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\n" ); document.write( "\"The total ticket sales were $ 1920. \"
\n" ); document.write( "12a + 7s + 4c = 1920
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\n" ); document.write( "\"There were 50 more adult tickets sold than child tickets,\"
\n" ); document.write( "a = (c + 50)
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\n" ); document.write( "\"the number of senior citizen tickets were 4 times the number of child tickets.\"
\n" ); document.write( "s = 4*c
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\n" ); document.write( "Substitute ((c+50) for a and 4c for s in the 1st equation, find c:
\n" ); document.write( "12(c+50) + 7(4c) + 4c = 1920
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\n" ); document.write( "12c + 600 + 28c + 4c = 1920
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\n" ); document.write( "12c + 28c + 4c = 1920 - 600
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\n" ); document.write( "44c = 1320
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\n" ); document.write( "c = 1320/44
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\n" ); document.write( "c = 30 children
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\n" ); document.write( "Now use the equations you have to find the number of adults and seniors
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\n" ); document.write( "Substitute your values a, s, and c in the 1st equation to check your solutions
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