document.write( "Question 426992: A bank teller has 54 $4 and $20 bills in her cash drawer. The value of the bills of $780. How many $5 bills are there?\r
\n" ); document.write( "\n" ); document.write( "I tried X+Y= 54
\n" ); document.write( " X-Y= 20 \r
\n" ); document.write( "\n" ); document.write( "2X=34
\n" ); document.write( "X-17 $5 BILLS\r
\n" ); document.write( "\n" ); document.write( "THIS DOES NOT SEEM RIGHT \n" ); document.write( "
Algebra.Com's Answer #296975 by mananth(16946)\"\" \"About 
You can put this solution on YOUR website!
$5 bills x
\n" ); document.write( "$20 bill ------------ y
\n" ); document.write( "x+y= 54 .............1
\n" ); document.write( "5x+20y =780 .............2
\n" ); document.write( "
\n" ); document.write( "multiply (1)by -20
\n" ); document.write( "Multiply (2) by 1
\n" ); document.write( "-20x-20y =-1080
\n" ); document.write( "5x+20y=780
\n" ); document.write( "Add the two equations \r
\n" ); document.write( "\n" ); document.write( "-15x=-300
\n" ); document.write( "/-15
\n" ); document.write( "x=20 $5 bills
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "
\n" ); document.write( "x+y=54
\n" ); document.write( "20+y=54
\n" ); document.write( "y=54-20
\n" ); document.write( "y=34
\n" ); document.write( "y=34 $20 bill
\n" ); document.write( "
\n" ); document.write( " \n" ); document.write( "
\n" );