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Q. The simplest form of $63: 81$ is

Ratio, Proportion, and Variation

Solution:

The HCF of $63: 81$ is 3 .
We divide each term by 3 .
Then, $63: 81=\frac{63}{3}: \frac{81}{3}=21: 27$
$\therefore$ The simplest form of $63: 81$ is $21: 27$.