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)\"\" \"About 
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\"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
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