document.write( "Question 156349: A stamp collection consist 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 #115146 by oscargut(2103)\"\" \"About 
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x=number of 3 cents stamps
\n" ); document.write( "y=number of 8 cents stamps
\n" ); document.write( "z=number of 15 cents stamps\r
\n" ); document.write( "\n" ); document.write( "The number of 8 cent stamps is one less than triple the number of 3 cent stamps.
\n" ); document.write( "then \"y=3x-1\"
\n" ); document.write( "The number of 15 cent stamps is six less than the number of 8 cent stamps.
\n" ); document.write( "then \"z=y-6\"\r
\n" ); document.write( "\n" ); document.write( "The total value of all the stamps is $2.47.\r
\n" ); document.write( "\n" ); document.write( "\"0.03x%2B0.08y%2B0.15z=2.47\"\r
\n" ); document.write( "\n" ); document.write( "we have to find y so we solve for x and z
\n" ); document.write( "\"y=3x-1\" then \"x=%28y%2B1%29%2F3\"
\n" ); document.write( "\"z=y-6\"
\n" ); document.write( "then\r
\n" ); document.write( "\n" ); document.write( "\"0.03%28y%2B1%29%2F3%2B0.08y%2B0.15%28y-6%29=2.47\"
\n" ); document.write( "\"0.01y%2B0.01%2B0.08y%2B0.15y-0.9=2.47\"
\n" ); document.write( "\"0.24y-0.89=2.47\"
\n" ); document.write( "\"0.24y=3.36\"
\n" ); document.write( "\"y=14\"\r
\n" ); document.write( "\n" ); document.write( "Answer: the number of 8 cent stamps is 14\r
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