document.write( "Question 799647: A girl went to school & the teacher asked how old are you? She replied I don't know, bt I know that I'm half my mother's age. The teacher asked ok how old is your mother? She said I don't know but I know that my Dad is 5 yrs older than my mother. Teacher, how old is yor dad? She said I don't know but I know that if we add our ages the answer is 100 yrs... Nw how old is the girl, her mum & dad. \n" ); document.write( "
Algebra.Com's Answer #482742 by mananth(16946)![]() ![]() You can put this solution on YOUR website! A girl went to school & the teacher asked how old are you? She replied I don't know, bt I know that I'm half my mother's age. The teacher asked ok how old is your mother? She said I don't know but I know that my Dad is 5 yrs older than my mother. Teacher, how old is yor dad? She said I don't know but I know that if we add our ages the answer is 100 yrs... Nw how old is the girl, her mum & dad.\r \n" ); document.write( "\n" ); document.write( "Girl's age = x ( she does not know)\r \n" ); document.write( "\n" ); document.write( "half mother's age so mother is twice her age = 2x\r \n" ); document.write( "\n" ); document.write( "Dad is 5 years older than mom\r \n" ); document.write( "\n" ); document.write( "Dad = 2x+5 years\r \n" ); document.write( "\n" ); document.write( "Sum of their ages = 100\r \n" ); document.write( "\n" ); document.write( "x+2x+2x+5 =100\r \n" ); document.write( "\n" ); document.write( "5x+5=100 \n" ); document.write( "5x=100-5 \n" ); document.write( "5x=95 \n" ); document.write( "/5 \n" ); document.write( "x=19 \n" ); document.write( "So the girl is 19 years\r \n" ); document.write( "\n" ); document.write( "so Mom is 2 *19 = 38 years\r \n" ); document.write( "\n" ); document.write( "Dad you find out. their sum is 100 \n" ); document.write( " |