Section A has 30 students with average marks 65, and section B has 20 students with average marks 70. What is the average of all 50 students?

A. 66

B. 67

C. 67.5

D. 68

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cgl Save WhatsApp Report

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Answer: B. 67

Answer: (B) 67

Combined average = \(\frac{30 \times 65 + 20 \times 70}{50} = \frac{3350}{50} = 67\).

Shortcut: the answer lies closer to 65 because section A is bigger: 65 + 5 × 20/50 = 67.

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

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