You are Here : Home » Aptitude » Averages The average of marks obtained by 120 boys was 35. If the average of marks of passed boys was 39 and that of failed boys was 15, the number of boys who passed the examination is? A. 100 B. 110 C. 120 D. 130 Answer Workspace Report Discuss Answer with explanation Answer: Option A Explanation Let the number of boys who passed = X. Then, 39 x X + 15 x (120 – X) = 120 x 35 24X = 4200 – 1800 => X = 2400/24 X = 100. Hence, the number of boys passed = 100. Workspace
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