document.write( "Question 320128: Dave Bowers collects U.S. gold coins. He has a collection of 41 coins. Some are $10 coins, and the rest are $20 coins. If the face value of the coins is $540, how many of each denomination does he have?
\n" ); document.write( "Thank You.
\n" ); document.write( "

Algebra.Com's Answer #229349 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
20X+10(41-X)=540
\n" ); document.write( "20X+410-10X=540
\n" ); document.write( "10X=540-410
\n" ); document.write( "10X=130
\n" ); document.write( "X=130/10
\n" ); document.write( "X=13 ANS. FOR THE NUMBER OF $20 COINS.
\n" ); document.write( "41-13=28 ANS. FOR THE NUMBER OF $10 COINS.
\n" ); document.write( "PROOF:
\n" ); document.write( "20*13+10*28=540
\n" ); document.write( "260+280=540
\n" ); document.write( "540=540
\n" ); document.write( "
\n" );