Find :
$$\cfrac{7}{8}$$ of a day
A day contains $$24$$ hours.
$$24$$ can also be written as $$\cfrac{24}{1}$$
$$\therefore$$ We have:
$$\cfrac{7}{8}$$ of $$\cfrac{24}{1}$$
This can be written as,
$$\cfrac{7}{8}\times \cfrac{24}{1}$$
By the rule Multiplication of fraction,
Product of fraction=$$\cfrac{product\ of\ numerator}{product\ of\ denominator}$$
So,
$$\cfrac{7}{8}\times \cfrac{24}{1}=\cfrac{(7\times 24)}{(8\times 1)}$$
$$=\cfrac{(7\times 3)}{(1\times 1)}$$
$$=21$$
$$\cfrac{7}{8}$$ of $$24$$ is $$21$$
So,
$$\cfrac{7}{8}$$ of a day is $$21\ hours$$