Question 1173484: the total of three sisters ages is 39. Dina is half as old as Michelle and 3 years younger than Juliette. how old are the sisters? Found 3 solutions by ankor@dixie-net.com, josgarithmetic, MathTherapy:Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website! the total of three sisters ages is 39.
d + m + j = 39
Dina is half as old as Michelle
d = .5m
or multiply be 2
m = 2d
and 3 years younger than Juliette.
d = j - 3
or Add 3 to both sides
j = d + 3
how old are the sisters?
Replace m with 2d, replace j with (d+3) in the first equation
d + 2d + (d+3) = 39
4d = 39 - 3
4d = 36
d = 36/4
d = 9 yr is Dina's age
and
2(9) = 18 yrs is Michelle's age
and
9+3 = 12 yrs is Julie's age
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Check: 9 + 18 + 12 = 39 Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website! Identical to question number 1173396. Simple to answer, and easily done in just one single variable. Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!
the total of three sisters ages is 39. Dina is half as old as Michelle and 3 years younger than Juliette. how old are the sisters?
Let Dina's age be D
Then Michelle's, and Juliette's are, 2D and D + 3, respectively
We then get: D + 2D + D + 3 = 39
4D = 36
Dina, or
You should now be able to find Michelle's and Juliette's ages!