The following pie charts show the data of the number of appeared and passed students of class 12 in sections A, B, C, D and E.

How many students failed in Section C?

The correct answer is 300.

Based on the data and the pie charts provided in the question:
- The total number of students who appeared for the exam across all sections is 1800, which is represented by the first pie chart with angles totaling 360°.
- The total number of students who passed the exam across all sections is 800, which is represented by the second pie chart with percentages totaling 100%.

From the first pie chart, Section C has a central angle of 100°.

To find the number of students who appeared from Section C:
$\text{Appeared in Section C}=\frac{100}{360}\times 1800=500$

From the second pie chart, the percentage of passed students belonging to Section C is 25%.

To find the number of students who passed from Section C:
$\text{Passed in Section C}=25\%\text{ of }800=\frac{25}{100}\times 800=200$

The number of students who failed in Section C is calculated by subtracting the number of passed students from the number of appeared students in Section C:

$\text{Failed in Section C}=\text{Appeared in Section C}-\text{Passed in Section C}$

$\text{Failed in Section C}=500-200=300$