document.write( "Question 23910: a postal clerk sold 75 stamps for $4.80. some were 5-cent and some were 8-cent stamps. how many of each kind did he sell? \n" ); document.write( "
Algebra.Com's Answer #12621 by Paul(988)![]() ![]() ![]() You can put this solution on YOUR website! Let x represent the 8-cent stamp \n" ); document.write( "Let y represent the 5-cent stamp\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x+y=75 \n" ); document.write( "y=75-x\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "8x+5y=480 \n" ); document.write( "8x+5(75-x)=480 \n" ); document.write( "8x+375-5x=480 \n" ); document.write( "3x = 105 \n" ); document.write( "x = 35\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "y=75-35 \n" ); document.write( "y=40\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Hence, he sold 40 5-cent stamp and 35 8-cent stamp. \n" ); document.write( "Paul. \n" ); document.write( " |