• # question_answer If answer to all questions he attempter by guessing were wrong and answered $\text{5}0%$correctly, then how many marks he got? A) 45 B) 55       C) 65 D) 40

 [a] Marks $=50%$ of $120-\frac{1}{4}$ of $50%$of 120 $=\frac{1}{2}\times 120-\frac{1}{4}\times \frac{1}{2}\times 120=60-15=45$ So option [a] is correct.