26-10-2015
Mathematics

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3/9=21/k proportion

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26-10-2015

[tex]\frac{3}{9} = \frac{21}{k}\\\\\frac{1}{3}= \frac{21}{k}\\\\\sf Cross~multiply\\\\1(k) = 21(3)\\\\k = 21(3)\\\\\boxed{k = 63}[/tex]

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