document.write( "Question 899867: A purse contains rupees 5 coins and some rupees 10 coins. If the total no of these coins is 20 and the total value of these coins is rupees 175. Find the no. of rupees 10 coins in the purse. \n" ); document.write( "
Algebra.Com's Answer #545666 by richwmiller(17219)\"\" \"About 
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x+y=20,
\n" ); document.write( "5*x+10*y=175
\n" ); document.write( "x=20-y
\n" ); document.write( "5*(20-y)+10*y=175
\n" ); document.write( "100-5y+10*y=175
\n" ); document.write( "5*y=75
\n" ); document.write( "y=15
\n" ); document.write( "x=20-y
\n" ); document.write( "x=5 y=15
\n" ); document.write( "check
\n" ); document.write( "5+15=20
\n" ); document.write( "5*x+10*y=175
\n" ); document.write( "5*5+10*15=175
\n" ); document.write( "25+150=175
\n" ); document.write( "175=175
\n" ); document.write( "ok
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