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20 March, 19:40

5 times marys age is the same as 28 less than 7 times her age. Find her age

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Answers (2)
  1. 20 March, 21:43
    0
    14yrs

    Step-by-step explanation:

    Mary's age=x

    5•x = x•7-28

    => 5x-7x = - 28

    => - 2x = - 28

    => x = - 28/-2

    => x = 14
  2. 20 March, 22:26
    0
    setup a simple algebraic equation and solve.

    5x = 7x-28

    -5x - 5x

    0=2x-28

    +28 + 28

    28=2x

    Now divide both sides by 2 and you get that she is 14
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