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.
Solution:
Let the school opened for $x$ days in the given year.
We have :
$90 \%$ of $x=216$
$\Rightarrow \frac{90}{100} x=216$
$\Rightarrow x=\frac{216 \times 100}{90}$
$=240$
$\therefore$ The school opened for 240 days in the given year.
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