Write the following ratio in lowest form:
$15 : 40$ __________

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Solution

To get lowest form of ratio $15 : 40$ which can also be written as $\frac{15}{40}$
Divide both numerator and denominator by HCF of $15$ and $40$ which equals to $5$ .
$\frac{15}{40} = \frac{\frac{15}{5}}{\frac{40}{5}} = \frac{3}{8}$
Hence, lowest form of ratio $15 : 40$ is $3 : 8$ .

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