If 15 out of 20 students passed in a test, then the percentage of students who have failed is .

اگر کسی امتحان میں 20 میں سے 15 طلبہ پاس ہوتے ہیں تو فیل ہونے والے طلبہ کا فیصد ہے۔

10 %

15 %

20 %

25 %

Explanation

Given, $15$ out of $20$ students have passed the test.
So, $(20 - 15) = 5$ students must have failed the test.

Percentage of students who have failed
$= \frac{Number of students failed}{Total number of students} \times 100 = \frac{5}{20} \times 100 = 25 %$