asura
asura
26-10-2015
Mathematics
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3/9=21/k proportion
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TSO
TSO
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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