document.write( "Question 173305: A stamp collection consists of 3, 8, and 15 cent stamps. The number of 8 cent stamps is one less than triple the number of 3 cent stamps. The number of 15 cent stamps is six less than the number of 8 cent stamps. The total value of all the stamps is $2.47. Find the number of 8 cent stamps in the collection \n" ); document.write( "
Algebra.Com's Answer #128174 by solver91311(24713)\"\" \"About 
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Let \"n\" be the number of 3 cent stamps, then the number of 8 cent stamps has to be \"3n-1\", and then the number of 15 cent stamps is \"%283n-1%29-%286%29=3n-7\"\r
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\n" ); document.write( "\n" ); document.write( "The value of the 3 cent stamps, in cents, is \"3n\"\r
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\n" ); document.write( "\n" ); document.write( "The value of the 8 cent stamps, in cents, is \"8%283n-1%29=24n-8\"\r
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\n" ); document.write( "\n" ); document.write( "The value of the 15 cent stamps, in cents, is \"15%283n-7%29=45n-105\"\r
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\n" ); document.write( "\n" ); document.write( "The sum of these values is $2.47, or expressed in cents, 247 cents, so you can write:\r
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\n" ); document.write( "\n" ); document.write( "\"3n%2B24n-8%2B45n-105=247\"\r
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\n" ); document.write( "\n" ); document.write( "Simplified:\r
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\n" ); document.write( "\n" ); document.write( "\"72n-113=247\"\r
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\n" ); document.write( "\n" ); document.write( "\"72n=360\"\r
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\n" ); document.write( "\n" ); document.write( "\"n=5\".\r
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\n" ); document.write( "\n" ); document.write( "So there are five 3-cent stamps. I'll leave it to you to figure out how many 8 and 15 cent stamps based on knowing there are five 3-cent stamps. You should also check the work to make sure your answers fulfill the requirements of the problem statement.
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