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2 July, 18:17

28/21 = 42/x solve for x

A: 14

B: 18 2/3

C: 31 1/2

D: 56

i cant figure out what it is, and im slightly confused

+2
Answers (2)
  1. 2 July, 20:37
    0
    28/21=42/x multiply both sides by x

    28/21x=42 divide by 28/21 on both sides (or multiply both sides by 21/28)

    X = 63/2

    X = 31 1/2
  2. 2 July, 20:56
    0
    28/21 = 42/x

    Cross Multiply

    28*x = 21*42

    x = 21*42/28 use your calculator.

    x = 31.5

    x = 31 1/2

    option C

    Hope this explains it.
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