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

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leeandrews2 leeandrews2 · Answer 1 · 2017-01-06T20:21:14+01:00

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

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olemakpadu olemakpadu · Answer 2 · 2017-01-06T20:30:44+01:00

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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