The ratio is equivalent to 3 : 7 ?

3:9

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6:10

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9:21

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18:49

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Solution

The correct option is C 9:21
On simplification i.e., dividing the numerator and denominator by 3, 9 : 21 becomes 3:7.
$\Rightarrow 9 : 21 = \frac{9}{3} : \frac{21}{3} = 3 : 7$

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