document.write( "Question 119684: samantha has 30 coins, quarters and dimes, which total $5.70. How many of each does she have? \n" ); document.write( "

Algebra.Com's Answer #87670 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
q = number of quarters
\n" ); document.write( "d = number of dimes
\n" ); document.write( " $\"25q+%2B+10d+=+570\"$
\n" ); document.write( " $\"q+%2B+d+=+30\"$
\n" ); document.write( " $\"d+=+30+-+q\"$
\n" ); document.write( " $\"25q+%2B+10%2830+-+q%29+=+570\"$
\n" ); document.write( " $\"25q+%2B+300+-+10q+=+570\"$
\n" ); document.write( " $\"15q+=+270\"$
\n" ); document.write( " $\"q+=+18\"$
\n" ); document.write( " $\"d+=+30+-+q\"$
\n" ); document.write( " $\"d+=+30+-+18\"$
\n" ); document.write( " $\"d+=+12\"$
\n" ); document.write( "She has 18 quarters and 12 dimes
\n" ); document.write( "check:
\n" ); document.write( " $\"25q+%2B+10d+=+570\"$
\n" ); document.write( " $\"25%2A18+%2B+10%2A12+=+570\"$
\n" ); document.write( " $\"450+%2B+120+=+570\"$
\n" ); document.write( " $\"570+=+570\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );