document.write( "Question 117407: David has collected $6.50 in nickels and dimes. If she has 75 coins, how many of each coin does she have? \n" ); document.write( "

Algebra.Com's Answer #85414 by josmiceli(19441) $\"\"$ $\"About$

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N = number of nickels
\n" ); document.write( "D = number of dimes
\n" ); document.write( "N + D = 75
\n" ); document.write( "N = 75 - D
\n" ); document.write( "650 = 5N + 10D
\n" ); document.write( "divide both sides by 5
\n" ); document.write( "130 = N + 2D
\n" ); document.write( "130 = 75 - D + 2D
\n" ); document.write( "D = 130 - 75
\n" ); document.write( "D = 55
\n" ); document.write( "N + D = 75
\n" ); document.write( "N = 75 - 55
\n" ); document.write( "N = 20
\n" ); document.write( "There are 20 nickels and 55 dimes
\n" ); document.write( "check answer
\n" ); document.write( "There are 75 coins-that checks
\n" ); document.write( "650 = 5N + 10D
\n" ); document.write( "650 = 5*20 + 10*55
\n" ); document.write( "650 = 100 + 550
\n" ); document.write( "650 = 650
\n" ); document.write( "OK \n" ); document.write( "

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