document.write( "Question 762969: manori\"s bag contained 10c and 20c coins she had 202 coins with a total value of $ 31.90 how many 20 cent coins did manori have \n" ); document.write( "

Algebra.Com's Answer #464463 by Cromlix(4381) $\"\"$ $\"About$

You can put this solution on YOUR website!
x = 10c
\n" ); document.write( "y = 20c
\n" ); document.write( "x + y = 202...1
\n" ); document.write( "10x + 20y = 3190...2
\n" ); document.write( "Multiply (1) by 20
\n" ); document.write( "20x + 20y = 4040...3
\n" ); document.write( "10x + 20y = 3190...4
\n" ); document.write( "Subtract (4) from (3)
\n" ); document.write( "10x = 850
\n" ); document.write( " x = 85
\n" ); document.write( "Substitute x = 85 in (1)
\n" ); document.write( "x + y = 202
\n" ); document.write( "85 + y = 202
\n" ); document.write( " y = 202 - 85
\n" ); document.write( " y = 117
\n" ); document.write( "Manori has 85 x 10c + 117 x 20c
\n" ); document.write( "Hope this helps.
\n" ); document.write( ":-) \n" ); document.write( "

\n" );