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?
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Algebra.Com's Answer #229349 by checkley77(12844) ![]() 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( " |