The question in the image reads:

"In a class of 30 students, 80% of students failed in the examination. How many students passed in this examination?"

Let's solve it.

Solution:

1. Total number of students = 30
2. Percentage of students who failed = 80%

Since 80% of the students failed, the remaining 20% of students passed.

3. Percentage of students who passed = 100% - 80% = 20%

4. Number of students who passed = $\text{Total students} \times \frac{\text{Percentage of students who passed}}{100}$

   = 30 \times 0.2 = 6$$

Answer:

6 students passed in the examination.

Would you like more details on this calculation or have any questions?

Here are five related questions to further explore this topic:

1. If 70% of a class of 40 students passed, how many students failed?
2. In a school with 100 students, if 25% failed, how many students passed?
3. If 50 students took an exam and 40% passed, how many failed?
4. In a class of 20 students, if 15 students passed, what percentage of students failed?
5. If 90% of a class of 60 students failed, how many students passed?

Tip: Remember, to find a part of a group based on a percentage, multiply the total by the percentage (in decimal form).