document.write( "Question 1145239: Mark has a total of 21 coins consisting of nickels and quarters. The total value of the coins is $2.45. How many of each type of coin does he have?\r
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Algebra.Com's Answer #766468 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "If all the coins were nickels, the value would be 21($.05) = $1.05. \n" ); document.write( "The actual total value is $2.45, which is $1.40 more than $1.05. \n" ); document.write( "Trading a quarter for a nickel keeps the total number of coins the same but increases the total by $.25-$.05 = $.20. \n" ); document.write( "To make the correct total of $2.45, the number of nickels that need to be traded for quarters is $1.40/$0.20 = 7 \n" ); document.write( "ANSWER: 7 quarters; the rest (14) nickels \n" ); document.write( "CHECK: 7($.25)+14($.05) = $1.75+$.70 = $2.45 \n" ); document.write( " |