document.write( "Question 1157918: you dump out your piggy bank and find that you have only nickels and dimes. there are a total of 50 coins and the coins add up to 3.90 how many nickles do you have ? \n" ); document.write( "
Algebra.Com's Answer #780817 by mananth(16946)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "you dump out your piggy bank and find that you have only nickels and dimes.\r
\n" ); document.write( "\n" ); document.write( "nickel 5 cents
\n" ); document.write( "dime 10 cents\r
\n" ); document.write( "\n" ); document.write( " there are a total of 50 coins
\n" ); document.write( "x+y =50
\n" ); document.write( " and the coins add up to $3.90
\n" ); document.write( "5x+10y = 390 (3.90==390 cents) \r
\n" ); document.write( "\n" ); document.write( "solve the equations\r
\n" ); document.write( "\n" ); document.write( "1.00 x + 1.00 y = 50.00
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\n" ); document.write( "5.00 x + 10.00 y = 390.00 .............2
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -10.00
\n" ); document.write( "Multiply (2) by 1.00
\n" ); document.write( "-10.00 x -10.00 y = -500.00
\n" ); document.write( "5.00 x 10.00 y = 390.00
\n" ); document.write( "Add the two equations
\n" ); document.write( "-5.00 x = -110.00
\n" ); document.write( "/ -5.00
\n" ); document.write( "x = 22.00
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "1.00 x + 1.00 y = 50.00
\n" ); document.write( "22.00 + 1.00 y = 50.00
\n" ); document.write( " 1.00 y = 28.00
\n" ); document.write( " y = 28.00
\n" ); document.write( "Ans x = 22 numbers
\n" ); document.write( " y = 28 numbers \r
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