document.write( "Question 772773: the sum of the ages of a mother & her daughter is 60 years.12 years ago the mother was eight times as old as her daughter.how old is the daughter now? \n" ); document.write( "
Algebra.Com's Answer #471107 by malglu(63)![]() ![]() ![]() You can put this solution on YOUR website! let age mum now be m \n" ); document.write( "age daughter now =d\r \n" ); document.write( "\n" ); document.write( "1)m+d=60\r \n" ); document.write( "\n" ); document.write( "2)m-12 = 8(d-12) \n" ); document.write( "m-12 =8d -96 \n" ); document.write( "rearrange to make \n" ); document.write( "m=8d-84\r \n" ); document.write( "\n" ); document.write( "substitute this into the first equation to make\r \n" ); document.write( "\n" ); document.write( "8d-84+d=60 \n" ); document.write( "rearrange and solve \n" ); document.write( "9d-84=60 \n" ); document.write( "9d=144 \n" ); document.write( "d=16 \n" ); document.write( " \n" ); document.write( " |