In a test (+4) marks are given you every correct answer and

Resposta:

4 incorrect answers.

Explicação passo a passo:

If for each correct answer Mithun scores +4 and -2 for each incorrect answer, we can do:

Final score: 64;

Correct answers: 18;

18*4 = 72 (Score for 18 correct answers)

(72-64)/2 = 4 incorrect answers.