document.write( "Question 215899: Rory claims: \"I have $20 in quarters, half dollars, and one-dollar bills. I have twice as many quarters as half dollars, and half as many one-dollar bills as half dollars\". Give a convincing argument to explain why he must be wrong? \n" ); document.write( "
Algebra.Com's Answer #163107 by ptaylor(2198) You can put this solution on YOUR website! CONVINCING ARGUMENT: \n" ); document.write( "In order for his claim to be correct, the number quarters, half-dollars and one dollar bills need to be whole numbers and this does not happen. When we solve our equation, we end up with 13 1/3 half dollars, so his claim must be flawed.\r \n" ); document.write( "\n" ); document.write( "Let x=number of half dollars; 0.5x=value of half dollars \n" ); document.write( "Then 2x=number of quarters; 0.25(2x)=0.5x=value of quarters \n" ); document.write( "And 0.5x= number of dollar bills; 1(0.5x)=0.5x=value of dollar bills \n" ); document.write( "So, our equation to solve is: \n" ); document.write( "0.5x+0.5x+0.5x=20 \n" ); document.write( "1.5x=20 divide each side by 1.5 \n" ); document.write( "x=13 1/3 --------------number of half dollars NO WAY!!!!!\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Hope this helps---ptaylor \n" ); document.write( " |