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Preston
Preston asked in Science & MathematicsMathematics · 6 years ago

Solve for K? help please and a step by step process to refresh my memory would be great!?

K-9 7

------ = ------

27 9

Update:

its supposed to be k-9 over 27 = 7 over 9

2 Answers

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  • l
    6 years ago
    Favorite Answer

    first cross multiply : 9(k-9) = 27(7)

    divide both sides by 9 : k-9 = 21

    add 9 to both sides: k = 30

  • Prateek
    Lv 5
    6 years ago

    (K-9) / 27 = 7 / 9

    Multiply both sides with 9.

    (K-9) / 3 = 7

    Multiply both sides with 3.

    (K-9) = 21

    Add 9 to both sides.

    K = 30

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