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)![]() ![]() You can put this solution on YOUR website! x = number of 30 cent stamps \n" ); document.write( "y = number of 40 cent stamps\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 3y \n" ); document.write( "30x + 40y = 2080\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Use substitution.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "30(3y) + 40y = 2080 \n" ); document.write( "130y = 2080 \n" ); document.write( "y = 16\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Gerald bought 48 30-cent stamps and 16 40-cent stamps. \n" ); document.write( " |