31-08-2015
Mathematics

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3r/4= 1/8 what's the value of r

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31-08-2015

Multiplying both sides by 8, we see that 6r=1. Dividing by 6, r=1/6.

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31-08-2015

[tex] \frac{3r}{4} =\frac{1}{8}[/tex]

Cross multiply.
Note: [tex]\sf\frac{a}{b} = \frac{c}{d} \to ad=bc[/tex]

Cross multiplying we get:

[tex]3r(8) = 4(1) \\ 24r = 4\\r = \frac{4}{24} \\\\r=\frac{1}{6}[/tex]

I hope that helps :)

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