The average age of 30 students in a class is 14 years. When the teacher's age is included, the average rises by 1 year. What is the teacher's age?

A. 45 years

B. 46 years

C. 44 years

D. 40 years

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

1 answer

Best answer

Answer: A. 45 years

Answer: (A) 45 years

Shortcut: teacher = new average + 30 × rise = 15 + 30 × 1 = 45 years.

Plain: 31 × 15 − 30 × 14 = 465 − 420 = 45.

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

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