document.write( "Question 198518: Twenty-five coins, whose value is $2.75 are made up of nickels, dimes, and quarters. If the nickels were dimes, the dimes were quarters, and the quarters were nickels, the total value would be $3.75. How many coins of each type are there? \n" ); document.write( "
Algebra.Com's Answer #149051 by Edwin McCravy(20060)![]() ![]() You can put this solution on YOUR website! Twenty-five coins, whose value is $2.75 are made up of nickels, dimes, and quarters. If the nickels were dimes, the dimes were quarters, and the quarters were nickels, the total value would be $3.75. How many coins of each type are there?\r \n" ); document.write( "\n" ); document.write( "Twenty-five coins,\r \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "so we write:\r\n" ); document.write( "\r\n" ); document.write( "N + D + Q = 25\r\n" ); document.write( " \n" ); document.write( "whose value is $2.75 are made up of nickels, dimes, and quarters. \n" ); document.write( " \r\n" ); document.write( "so we write:\r\n" ); document.write( "\r\n" ); document.write( "5N + 10D + 25Q = 275\r\n" ); document.write( " \n" ); document.write( "If the nickels were dimes, \n" ); document.write( " \r\n" ); document.write( "we'd have 10N cents\r\n" ); document.write( " \n" ); document.write( "the dimes were quarters, \n" ); document.write( " \r\n" ); document.write( "we'd have 25D cents\r\n" ); document.write( " \n" ); document.write( "and the quarters were nickels, \n" ); document.write( " \r\n" ); document.write( "we'd have 5Q cents.\r\n" ); document.write( " \n" ); document.write( "the total value would be $3.75. \n" ); document.write( " \r\n" ); document.write( "So 10N + 25D + 5Q = 375\r\n" ); document.write( "\r\n" ); document.write( "So the system is\r\n" ); document.write( "\r\n" ); document.write( " N + D + Q = 25\r\n" ); document.write( " 5N + 10D + 25Q = 275\r\n" ); document.write( "10N + 25D + 5Q = 375\r\n" ); document.write( "\r\n" ); document.write( "Solve that and get 10 nickels, 10 dimes and 5 quarters.\r\n" ); document.write( "\r\n" ); document.write( "10 nickels = 50 cents\r\n" ); document.write( "10 dimes = 100 cents\r\n" ); document.write( "5 quarters = 125 cents\r\n" ); document.write( " ---------\r\n" ); document.write( " 275 cents or $2.75\r\n" ); document.write( "\r\n" ); document.write( "If we had\r\n" ); document.write( "\r\n" ); document.write( "10 dimes = 100 cents\r\n" ); document.write( "10 quarters = 250 cents\r\n" ); document.write( "5 nickels = 25 cents\r\n" ); document.write( " ---------\r\n" ); document.write( " 375 cents or $3.75 \r\n" ); document.write( "\r\n" ); document.write( "So it checks.\r\n" ); document.write( "\r\n" ); document.write( "Edwin\n" ); document.write( " |