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Math Help - Need help please

  1. #1
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    Angry Need help please

    Mrs. Brown is 20 years old than her daughter.Five years ago,she was 3 times as old as her daughter.How old is her daughter? Can u tell me please Thank You



    Sri
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  2. #2
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    Quote Originally Posted by sri340 View Post
    Mrs. Brown is 20 years old than her daughter.Five years ago,she was 3 times as old as her daughter.How old is her daughter? Can u tell me please Thank You

    Sri
    Age of Mrs. B today: y
    Age of the daughter today: x

    From the question you know:

    x+20=y

    y-5=3(x-5) ..... That's the situation 5 years ago. Be aware that the daughter was 5 years younger too!

    This is a system of simultaneous equations. Solve this system of equations for x and y. (Use substitution method here)



    I've got: (x, y) = (15, 35)
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  3. #3
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    B = Mrs. Brown
    D = Daughter

    D+20 = B
    3D = B
    D + 20 = 3D
    20 = 2D
    10 = D

    But this situation was 5 years ago so...

    D + 5 = Age
    10 + 5 = 15
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