document.write( "Question 1204785: 2/5 of A's money is equal to 2/3 of B's money, and $48 is the sum of their money. Determine A and B's amount.\r
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document.write( "2/5 of A's = 2/3 of B's.\r
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document.write( "1/5 of A's = 1/2 as much as 2/5, and 1/2 of 2/3 = 1/3 of B's.\r
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document.write( "Not sure how to proceed. \n" );
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Algebra.Com's Answer #841271 by greenestamps(13203)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "Given the fact that 2/5 of A's money is 2/3 of B's money, you had the thought of, in effect, dividing each fraction by 2 to see that 1/5 of A's money is 1/3 of B's money. \n" ); document.write( "That was potentially a good thought; but it didn't lead anywhere that you were able to see. \n" ); document.write( "In fact, one good start on the problem is to MULTIPLY both fractions by some number to make the information easier to work with. Since the denominators of the fractions are 5 and 3, we can clear fractions if we multiply both of the given fractions by 5*3=15: \n" ); document.write( " \n" ); document.write( "Then, using A+B=48, there are several possible paths to the solution. \n" ); document.write( "A couple of basic algebraic paths are these: \n" ); document.write( "(1) Change A+B=48 to B=48-A and substitute \"48-A\" for \"B\" in 3A-5B=0 \n" ); document.write( "(2) Use elimination with the two equations A+B=48 and 3A-5B=0 \n" ); document.write( "I myself prefer a less obvious path to the solution, like this: \n" ); document.write( "Given 3A = 5B, let A = 5x and B = 3x. \n" ); document.write( "Then A+B=48 becomes \n" ); document.write( "5x+3x=48 \n" ); document.write( "8x=48 \n" ); document.write( "x=6 \n" ); document.write( "and so \n" ); document.write( "ANSWERS: A = 5x = 30; B = 3x = 18 \n" ); document.write( " \n" ); document.write( " |