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Math

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I am a parent of a 10 year old, 5th grader and my hubby and I just can't figure these out to help her. Anyone?? Thanks in advance.

27 = 8k divide k = ??

5a - 3a = 18 a = ??

12r - 4r = 48 r = ??

g = 7(10-3) g = ??

These are finding the unknown number in each equation.
Thanks so much

  • Math -

    27 = 8k
    Divide both sides of the equation by 8.

    27/8 = k
    3.375 = k
    ______________________________________

    5a - 3a = 18
    2a = 18
    a = 9

    _____________________________

    Can you do the rest yourself? We'll be glad to check your answers.

  • Math -

    12r-4r=48r=

  • Math -

    5a-3a=18. What does a equal?

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