document.write( "Question 531715: If Mavis is 5 yrs older than her brother. 5 years ago she was twice her brother's age, how old are they now? \n" ); document.write( "
Algebra.Com's Answer #350559 by oberobic(2304)![]() ![]() ![]() You can put this solution on YOUR website! M = Mavis' age \n" ); document.write( "B = Brother's age \n" ); document.write( ". \n" ); document.write( "M = B+5 \n" ); document.write( ". \n" ); document.write( "Five years ago... \n" ); document.write( "M-5 \n" ); document.write( "B-5 \n" ); document.write( ". \n" ); document.write( "Mavis was twice her brother's age. \n" ); document.write( "(M-5) = 2(B-5) \n" ); document.write( ". \n" ); document.write( "Substitute M = B+5 \n" ); document.write( ". \n" ); document.write( "(B+5-5) = 2B-10 \n" ); document.write( ". \n" ); document.write( "B = 2B-10 \n" ); document.write( "-B = -10 \n" ); document.write( "B = 10 \n" ); document.write( ". \n" ); document.write( "M = B+5 = 15 \n" ); document.write( ". \n" ); document.write( "Check their ages 5 years ago. \n" ); document.write( "B = 10-5 = 5 \n" ); document.write( "M = 15-5 = 10 \n" ); document.write( "M = 2*B \n" ); document.write( "Correct. \n" ); document.write( ". \n" ); document.write( "Answer: Mavis is 15 and her brother is 10 years old. \n" ); document.write( ". \n" ); document.write( "Done. \n" ); document.write( " |