document.write( "Question 1169961: Mark is 8 years older than his sister Rita. Four years ago rita was two thirds as old as Mark. How old are they now? \n" ); document.write( "
Algebra.Com's Answer #794809 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! Rita is x \n" ); document.write( "Mark is x+8 \n" ); document.write( "four years earlier x-4 and x+4 respectively \n" ); document.write( "(x-4)/(x+4)=2/3. cross-multiply \n" ); document.write( "3x-12=2x+8 \n" ); document.write( "x=20 Rita \n" ); document.write( "x+8=28 Mark \n" ); document.write( "4 years earlier it was 16/24 and that is 2/3 \n" ); document.write( "they are 20 and 28 years old. \n" ); document.write( " |