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

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

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