If $9 : 7$ and $27 : x$ are equivalent ratios, what is the value of $x$ ?

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Solution

The correct option is B 21
Since $9 : 7$ and $27 : x$ are equivalent ratios, we can write $\frac{9}{7} = \frac{27}{x}$ .
For finding the value of $x$ , we will cross multiply the numbers.
$x = \frac{(7 \times 27)}{9} = 21$

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