document.write( "Question 250751: There is $12.80 in a vending machine, composed of dimes, nickels and quarters. The amount of dimes is 5 times the amount of nickels. The amount of quarters is the amount of nickels plus 15. How many of each coin are there ? \n" ); document.write( "
Algebra.Com's Answer #182609 by stanbon(75887)\"\" \"About 
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There is 12.80$ in a vending machine, composed of dimes, nickels and quarters. The amount of dimes is 5 times the amount of nickels.
\n" ); document.write( "The amount of quarters is the amount of nickels plus 15.
\n" ); document.write( "How many of each coin are there ?\r
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\n" ); document.write( "Equations:
\n" ); document.write( "Value Equation: 5n + 10d + 25q = 1280 cents
\n" ); document.write( "Quantity Eq::::: d = 5n
\n" ); document.write( "Quantity Eq::::: q = n+15
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\n" ); document.write( "Substitute for d and for n; then solve for \"n\":
\n" ); document.write( "5n + 10(5n) + 25(n+15) = 1280
\n" ); document.write( "55n + 25n + 375 = 1280
\n" ); document.write( "80n = 905
\n" ); document.write( "n = (not a whole number)
\n" ); document.write( "Check the posting of your problem.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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