document.write( "Question 174425: If you have 20 coins worth $1.35, and you only have nickels and dimes, how many do you have of each coin? \n" ); document.write( "

Algebra.Com's Answer #129413 by Mathtut(3670) $\"\"$ $\"About$

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lets call the number of nickels and dimes , n and d, respectively
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\n" ); document.write( "n+d=20...........eq 1
\n" ); document.write( ".05n+.1d=1.35....eq 2
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\n" ); document.write( "lets rewrite eq 1 to n=20-d and plug this value into eq 2
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\n" ); document.write( ".05(20-d)+.1d=1.35
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\n" ); document.write( "1-.05d+.1d=1.35
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\n" ); document.write( ".05d=.35
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\n" ); document.write( " $\"highlight%28d=7%29\"$ dimes
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\n" ); document.write( " $\"n=20-d=20-7=highlight%28n=13%29\"$ nickels
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