document.write( "Question 908729: the total of three sister's age is 39. Dina is half as old as Michelle and three years younger than Juliette. How old are the sisters? \n" ); document.write( "
Algebra.Com's Answer #551289 by JulietG(1812)![]() ![]() You can put this solution on YOUR website! D + M + J = 39 \n" ); document.write( "D =.5M, or M = 2D \n" ); document.write( "D = J-3, or J = D+3 \n" ); document.write( "Take the known values from the bottom equation and put them into the top \n" ); document.write( "D + M + J = 39 \n" ); document.write( "D + (2D) + (D+3) = 39 \n" ); document.write( "4D + 3 = 39 \n" ); document.write( "Subtract 3 from each side \n" ); document.write( "4D = 36 \n" ); document.write( "Divide each side by 4 \n" ); document.write( "D = 9 \n" ); document.write( "If Dina is 9, then Michelle is 18, and Juliette is 12 \n" ); document.write( "9 + 18 + 12 = 39 \n" ); document.write( " |