document.write( "Question 122802: If one-fourth a number is subtracted from one-half of the number, the difference is 3. Find the number and check your answer.\r
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Algebra.Com's Answer #90152 by bucky(2189)![]() ![]() ![]() You can put this solution on YOUR website! Let N represent the unknown number. \n" ); document.write( ". \n" ); document.write( "One-fourth of N is N divided by 4 which can be written as \n" ); document.write( ". \n" ); document.write( "One-half of N is N divided by 2 which can be written as \n" ); document.write( ". \n" ); document.write( "If you subtract one-fourth of N from one-half of N this subtraction can be written as: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "and the problem tells you that this equals 3. So, in equation form this subtraction is: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "You can now put the first term on the left side over a common denominator of 4 by multiplying \n" ); document.write( "it by \n" ); document.write( "by 1 ... so it does not change the term. This multiplication of the first term by \n" ); document.write( "changes the term to: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "and the equation then becomes: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "On the left side you combine the two terms by subtracting their numerators and placing the \n" ); document.write( "result over the common denominator. In other words: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "and when you substitute this new reduced form of the terms on the left side, the equation becomes: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "This equation can be solved for N by multiplying both sides by 4 to get rid of the denominator \n" ); document.write( "on the left side. Multiplying both sides by 4 results in: \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "So the answer to this problem is that the unknown number N equals 12. \n" ); document.write( ". \n" ); document.write( "Check: \n" ); document.write( ". \n" ); document.write( "One-half of 12 is 6, and one-fourth of 12 is 3. Then 6 - 3 = 3 which is what the problem says \n" ); document.write( "it should be. So the answer of N = 12 checks. \n" ); document.write( ". \n" ); document.write( "Hope this helps you to understand the problem. \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( " |