document.write( "Question 483547: The cost of a high-school ring is $145 for the large size and $115 for the regular. The total receipts from the sale of 120 rings was $15,060. How many rings were sold? \n" ); document.write( "

Algebra.Com's Answer #330910 by Tatiana_Stebko(1539) $\"\"$ $\"About$

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Let x the large size rings
\n" ); document.write( "Let y the regular size rings
\n" ); document.write( "There were sold 120 rings, then $\"x%2By=120\"$
\n" ); document.write( "The total receipts from the sale of 120 rings was $15,060, so $\"145x%2B115y=15060\"$
\n" ); document.write( "The system of equations
\n" ); document.write( " $\"system%28x%2By=120%2C+145x%2B115y=15060%29\"$
\n" ); document.write( "From the first equation $\"y=120-x\"$
\n" ); document.write( "Substitute into the second equation $\"145x%2B115%28120-x%29=15060\"$
\n" ); document.write( " $\"145x%2B13800-115x=15060\"$
\n" ); document.write( " $\"30x=1260\"$
\n" ); document.write( " $\"x=1260%2F30\"$
\n" ); document.write( " $\"x=42\"$ the large size rings were sold
\n" ); document.write( " $\"y=120-42=78\"$ the regular size rings were sold \n" ); document.write( "

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