document.write( "Question 815550: [ Three times as many children as adults attended a concert on Saturday. An adult ticket cost $7 and a child ticket cost $3. The theater collected a total of $6000.00. How many people bought tickets? ] \n" ); document.write( "

Algebra.Com's Answer #491035 by TimothyLamb(4379) $\"\"$ $\"About$

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c = 3a
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\n" ); document.write( "7a + 3c = 6000
\n" ); document.write( "7a + 3*3a = 6000
\n" ); document.write( "7a + 9a = 6000
\n" ); document.write( "16a = 6000
\n" ); document.write( "---
\n" ); document.write( "a = 375
\n" ); document.write( "c = 1125
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\n" ); document.write( "total attendance:
\n" ); document.write( "a + c = 1500
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