document.write( "Question 785789: A cashier has 20 bills, all of which are $10 or $20 bills. The total value of the money is $330. How many of each type does the cashier have? \n" ); document.write( "

Algebra.Com's Answer #477721 by mananth(16946) $\"\"$ $\"About$

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x= Number of $10 bills
\n" ); document.write( "y= Number of $ 20 bills
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\n" ); document.write( "1 x + 1 y = 20 .............1
\n" ); document.write( "Total value
\n" ); document.write( "10 x + 20 y = 330 .............2
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -20
\n" ); document.write( "Multiply (2) by 1
\n" ); document.write( "-20 x -20 y = -400
\n" ); document.write( "10 x + 20 y = 330
\n" ); document.write( "Add the two equations
\n" ); document.write( "-10 x = -70
\n" ); document.write( "/ -10
\n" ); document.write( "x = 7
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "1 x + 1 y = 20
\n" ); document.write( "7 + y = 20
\n" ); document.write( " y = 20 -7
\n" ); document.write( " y = 13
\n" ); document.write( " y = 13
\n" ); document.write( "x= 7 Number of $10 bills
\n" ); document.write( "y= 13 Number of $ 20 bills
\n" ); document.write( "m.ananth@hotmail.ca
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