Question

Deepti went to school for $216$ days in a full year. If her attendance is $90\%$, find the number of days on which the school was opened.

Answer 1

Given: Deepti’s attendance percentage $=90\%$
Number of days Deepti went to school $=216$

Let the number of days on which the school was opened be ${}^{\prime }{x}^{\prime }$

According to question,
$90\%$ of $x=216$

$\Rightarrow \frac{90}{100}\times x=216$

$\Rightarrow x=\frac{216\times 100}{90}$

$\Rightarrow x=24\times 10$

$\Rightarrow x=240$

Hence, the school remained open for $240$ days.