document.write( "Question 666033: Derek is four times as old as his brother.Five years ago,the sum of their ages was equal to derek's present age,How old is derek and his brother\" \n" ); document.write( "
Algebra.Com's Answer #414230 by bloggauta(8)![]() ![]() You can put this solution on YOUR website! \"Derek is four times as old as his brother\" → D= 4B\r \n" ); document.write( "\n" ); document.write( "\"Five years ago,the sum of their ages was equal to derek's present age\" → (D-5)+(B-5)=D \n" ); document.write( "► B= 10 then D= 40\r \n" ); document.write( "\n" ); document.write( "Derek is 40 years old and his brother is 5 years old \n" ); document.write( " |