document.write( "Question 1205731: 50 coins in dimes and quarters have a total value of $11.00. How many dimes and quarters are there? \n" ); document.write( "
Algebra.Com's Answer #842741 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "Informally.... \n" ); document.write( "If all 50 coins were dimes, the total value would be $5.00. \n" ); document.write( "The actual total value is $11.00, which is $6.00 more. \n" ); document.write( "Since each quarter is worth $0.15 more than each dime, the number of quarters must be $6.00/$0.15 = 600/15 = 40. \n" ); document.write( "ANSWER: 40 quarters and 10 dimes \n" ); document.write( "CHECK: 40($0.25)+10($0.10) = $10.00+$1.00 = $11.00 \n" ); document.write( "---------------------------------------------------------------------- \n" ); document.write( "And here is a really unorthodox solution, treating the problem as a mixture problem. \n" ); document.write( "You are mixing quarters worth 25 cents each with dimes worth 10 cents each to get a mixture of coins worth an average of $11.00/50 = 22 cents each. \n" ); document.write( "Since 22 cents is 4/5 of the way from 10 cents to 25 cents, 4/5 of the coins must be quarters. (From 10 to 25 is a difference of 15; from 10 to 22 is a difference of 12; 12/15 = 4/5.) \n" ); document.write( "4/5 of 50 is 40. \n" ); document.write( "ANSWER (again, of course): 40 quarters and 10 dimes \n" ); document.write( " \n" ); document.write( " |