document.write( "Question 424034: Marco had 150 coins,all nickels and dimes. He has 12 more dimes than nickels. How many nickels and how many dimes does he have ? \n" ); document.write( "

Algebra.Com's Answer #295715 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"d\"$ = number of dimes
\n" ); document.write( "Let $\"n\"$ = number of nickels
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"d+%2B+n+=+150\"$
\n" ); document.write( "(2) $\"d+=+n+%2B+12\"$
\n" ); document.write( "------------------------
\n" ); document.write( "Substitute (2) into (1)
\n" ); document.write( "(1) $\"+n+%2B+12+%2B+n+=+150\"$
\n" ); document.write( "(1) $\"+2n+=+150+-+12+\"$
\n" ); document.write( "(1) $\"+2n+=+138\"$
\n" ); document.write( " $\"n+=+69\"$
\n" ); document.write( "and, since
\n" ); document.write( "(2) $\"d+=+n+%2B+12\"$
\n" ); document.write( " $\"d+=+69+%2B+12\"$
\n" ); document.write( " $\"d+=+81\"$
\n" ); document.write( "He has 81 dimes and 69 nickels\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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