document.write( "Question 128502: Felix has 40 coins consisting of dimes and nickels. If the value of his coins is $3.80, then how many of each type does he have? \n" ); document.write( "

Algebra.Com's Answer #94045 by josmiceli(19441) $\"\"$ $\"About$

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$\"d\"$ = number of dimes
\n" ); document.write( " $\"n\"$ = number of nickels
\n" ); document.write( " $\"n+%2B+d+=+40\"$
\n" ); document.write( " $\"d+=+40+-+n\"$
\n" ); document.write( " $\"5n+%2B+10d+=+380\"$
\n" ); document.write( " $\"5n+%2B+10%2840+-+n%29+=+380\"$
\n" ); document.write( " $\"5n+%2B+400+-+10n+=+380\"$
\n" ); document.write( " $\"-5n+=+-20\"$
\n" ); document.write( " $\"n+=+4\"$
\n" ); document.write( " $\"d+=+40+-+n\"$
\n" ); document.write( " $\"d+=+36\"$
\n" ); document.write( "He has 4 nickels and 36 dimes
\n" ); document.write( "check answer:
\n" ); document.write( " $\"5n+%2B+10d+=+380\"$
\n" ); document.write( " $\"5%2A4+%2B+10%2A36+=+380\"$
\n" ); document.write( " $\"20+%2B+360+=+380\"$
\n" ); document.write( " $\"380+=+380\"$
\n" ); document.write( "OK \n" ); document.write( "

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