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)\"\" \"About 
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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
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