What if you have 28 questions and got 5 wrong?

To calculate your score, you can use the following formula:

Score = (Total number of questions - Incorrect answers) / Total number of questions

In your case, you have 28 questions and got 5 wrong.

Score = (28 - 5) / 28

Score = 23 / 28

Therefore, your score is 23 / 28 or approximately 0.82, as a percentage it would be 82%.