Math

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Find the value of x

40-x/3=4

please not the / means a fraction.

I already know that x is 28 when I first saw the question but I'm not sure how to show my working out.

  • Math (ANYONE! -

    Please I'm really struggling

  • Math -

    40 - x / 3 = 4 Add x / 3 to both sides

    40 - x / 3 + x / 3 = 4 + x / 3

    40 = 4 + x / 3 Subtract 4 to both sides

    40 - 4 = 4 + x / 3 - 4

    36 = x / 3 Multiply both sides by 3

    108 = x

    x = 108

  • Math -

    if you put that back into the equation it doesn't work.

  • Math -

    If your exspressio mean :

    ( 40 - x ) / 3 = 4

    Then multiply both sides by 3

    3 * ( 40 - x ) / 3 = 3 * 4


    40 - x = 12 Subtract 12 to both sides

    40 - x - 12 = 12 - 12

    28 - x = 0 Add x to both sides

    28 - x + x = 0 + x

    28 = x

    x = 28

  • Math -

    thank you!!

  • Math -

    You're welcome

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