document.write( "Question 971814: I need help with Age and Quotient- Remainder word problems.\r
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document.write( "Here is my question:\r
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document.write( "A girl is now one-third as old as her mother, and in three years she will be two-fifths as old as her mother is then. Find their present ages. \n" );
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Algebra.Com's Answer #594201 by rothauserc(4718)![]() ![]() You can put this solution on YOUR website! we have two equations in two unknowns, let x be the girl and y be her mother, then \n" ); document.write( "x = y/3 \n" ); document.write( "x + 3 = (2/5) * (y + 3) \n" ); document.write( "substitute for x in second equation \n" ); document.write( "y/3 + 3 = (2/5) * (y + 3) \n" ); document.write( "y/3 + 3 = 2y/5 + 6/5 \n" ); document.write( "multiply both sides of = by 15 \n" ); document.write( "5y + 45 = 6y + 18 \n" ); document.write( "y = 27 and x = 9 \n" ); document.write( "the girl is 9 and her mother is 27 \n" ); document.write( "check the answer by substituting for x and y in the second equation \n" ); document.write( "9 + 3 = 2/5 * (27 + 3) \n" ); document.write( "12 = (2/5) * 30 \n" ); document.write( "12 = 12 \n" ); document.write( "answer checks \n" ); document.write( " |