document.write( "Question 167513: Anna made the following announcement:\r
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document.write( "In 7 years, I will be half my mother's age. Thirteen years ago, she was 6 times as old as i was then. \r
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document.write( "How old is Anna now? \n" );
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Algebra.Com's Answer #123393 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! Anna made the following announcement: \n" ); document.write( "In 7 years, I will be half my mother's age. Thirteen years ago, she was 6 times as old as i was then. \n" ); document.write( "How old is Anna now? \n" ); document.write( "-------------------------------------- \n" ); document.write( "Let anna be x yrs old now. \n" ); document.write( "Let mother be y yrs old now. \n" ); document.write( "-------------------------------- \n" ); document.write( "EQUATIONS: \n" ); document.write( "x+7 = (1/2)(y+7) \n" ); document.write( "Y-13 = 6(x-13) \n" ); document.write( "------------------- \n" ); document.write( "Rearrange to solve: \n" ); document.write( "2x - y = -7 \n" ); document.write( "6x -y = -7*-13 \n" ); document.write( "--------------------- \n" ); document.write( "Subtract 1st equation from 2nd to get: \n" ); document.write( "4x = -7*-14 \n" ); document.write( "x= 24.5 yrs old now (Anna's age now) \n" ); document.write( "================= \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " \n" ); document.write( " |