Deepti went to school for 216 days in a full year.

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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