document.write( "Question 872392: A person has 20 coins, all nickels and dimes, worth $1.65. How many nickels are there \n" ); document.write( "

Algebra.Com's Answer #526119 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+n+\"$ = number of nickels
\n" ); document.write( "Let $\"+d+\"$ = number of dimes
\n" ); document.write( "--------------------------
\n" ); document.write( "(1) $\"+n+%2B+d+=+20+\"$
\n" ); document.write( "(2) $\"+5n+%2B+10d+=+165+\"$ ( in cents )
\n" ); document.write( "--------------------------------
\n" ); document.write( "(2) $\"+n+%2B+2d+=+33+\"$
\n" ); document.write( "Subtract (1) from (2)
\n" ); document.write( "(2) $\"+n+%2B+2d+=+33+\"$
\n" ); document.write( "(1) $\"+-n+-+d+=+-20+\"$
\n" ); document.write( "-------------------
\n" ); document.write( " $\"+d+=+13+\"$
\n" ); document.write( "and, since
\n" ); document.write( "(1) $\"+n+%2B+d+=+20+\"$
\n" ); document.write( "(1) $\"+n+%2B+13+=+20+\"$
\n" ); document.write( "(1) $\"+n+=+7+\"$
\n" ); document.write( "There are 7 nickels and 13 dimes
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+5n+%2B+10d+=+165+\"$
\n" ); document.write( "(2) $\"+5%2A7+%2B+10%2A13+=+165+\"$
\n" ); document.write( "(2) $\"+35+%2B+130+=+165+\"$
\n" ); document.write( "(2) $\"+165+=+165+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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