Question

As an architect you have designed a house that covers ${\frac{7}{10}}^{\text{th}}$ of the land while leaving the rest for the backyard, then percentage of land occupied by the backyard is $\text{\%}$

Answer 1

The house covers ${\frac{7}{10}}^{\text{th}}$ of the land.
$\therefore$ Land occupied by the backyard is $1-\frac{7}{10}=\frac{3}{10}$
$\therefore$ In percentage it can be represented as
$\frac{3}{10}\times 100\text{\%}=30\text{\%}$