Write the following ratios in lowest form:
$21 : 36$ _________

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Solution

To get lowest form of ratio $21 : 36$ which can also be written as $\frac{21}{36}$
Divide both numerator and denominator by HCF of $21$ and $36$ which equals to $3$ .
So,
$\frac{21}{36} = \frac{\frac{21}{3}}{\frac{36}{3}} = \frac{7}{12}$
Hence, lowest form of ratio $21 : 36$ is $7 : 12$

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