document.write( "Question 122512: Due to the abuse the pay phones in the school lobby are exposed to, some of them have a mind of their own and will only accept dimes and nickels. At the end of the day when they were emptied, one phone had 80 coins totaling $6.65. How many dimes had been deposited into that phone that day? \n" ); document.write( "

Algebra.Com's Answer #89931 by josmiceli(19441) $\"\"$ $\"About$

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Put the amount in the phone in terms of pennies
\n" ); document.write( " $\"d\"$ = number of dimes
\n" ); document.write( " $\"n\"$ = number of nickels
\n" ); document.write( " $\"n+%2B+d+=+80\"$
\n" ); document.write( " $\"5n+%2B+10d+=+665\"$
\n" ); document.write( " $\"d+=+80+-+n\"$
\n" ); document.write( " $\"5n+%2B+10%2880+-+n%29+=+665\"$
\n" ); document.write( " $\"5n+%2B+800+-+10n+=+665\"$
\n" ); document.write( " $\"-5n+=+-135\"$
\n" ); document.write( " $\"n+=+27\"$
\n" ); document.write( " $\"n+%2B+d+=+80\"$
\n" ); document.write( " $\"d+=+80+-+27\"$
\n" ); document.write( " $\"d+=+53\"$
\n" ); document.write( "There are 53 dimes and 27 nickels in the phone
\n" ); document.write( "check
\n" ); document.write( " $\"5n+%2B+10d+=+665\"$
\n" ); document.write( " $\"5%2A27+%2B+10%2A53+=+665\"$
\n" ); document.write( " $\"135+%2B+530+=+665\"$
\n" ); document.write( " $\"665+=+665\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );