document.write( "Question 973482: Mr. Smith has $4.90 in dimes and quarters in his wallet. If he has 7 more quarters than dimes how many of each coin does he have? \n" ); document.write( "
Algebra.Com's Answer #808008 by CubeyThePenguin(3113) You can put this solution on YOUR website! d = number of dimes \n" ); document.write( "q = number of quarters\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "10d + 25q = 490 \n" ); document.write( "q = d + 7\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Substitute the first equation into the second.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "10d + 25(d + 7) = 490 \n" ); document.write( "10d + 25d + 175 = 490 \n" ); document.write( "35d = 315 \n" ); document.write( "d = 9\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "There are 9 dimes and 16 quarters. \n" ); document.write( " |