document.write( "Question 1005780: Tim​'s piggy bank contains dimes and nickels worth ​$6.15. He has 77 coins in all. How many of each coin does Tim ​have? \n" ); document.write( "
Algebra.Com's Answer #621936 by fractalier(6550)\"\" \"About 
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Call the number of dimes and nickels, d and n. Then we have
\n" ); document.write( "d + n = 77 and the value equation is
\n" ); document.write( "10d + 5n = 615 (we work in cents)
\n" ); document.write( "Now multiply the top equation by five and subtract from the second...
\n" ); document.write( "10d + 5n = 615
\n" ); document.write( "-(5d + 5n = 385)
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\n" ); document.write( "5d = 230
\n" ); document.write( "d = 46 dimes
\n" ); document.write( "n must be 31 nickels
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