document.write( "Question 1030658: While gerald was at the post office he purchased some 40 cent stamps and three times as many 30 cent stamps. in all the stamps cost $20.80. how many of each did he buy \n" ); document.write( "
Algebra.Com's Answer #804064 by CubeyThePenguin(3113)\"\" \"About 
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x = number of 30 cent stamps
\n" ); document.write( "y = number of 40 cent stamps\r
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\n" ); document.write( "\n" ); document.write( "x = 3y
\n" ); document.write( "30x + 40y = 2080\r
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\n" ); document.write( "\n" ); document.write( "Use substitution.\r
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\n" ); document.write( "\n" ); document.write( "30(3y) + 40y = 2080
\n" ); document.write( "130y = 2080
\n" ); document.write( "y = 16\r
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\n" ); document.write( "\n" ); document.write( "Gerald bought 48 30-cent stamps and 16 40-cent stamps.
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