A class of 30 students appeared in a test. The average score of 12 students is 60, and that of the rest is 60. What is the average score of the class?

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Question

This question was previously asked in

RRB NTPC Graduate Level CBT-I Official Paper (Held On: 06 Jun, 2025 Shift 3)

Answer 1

Given:

Number of students = 30

Average score of 12 students = 60

Average score of remaining students = 60

Formula used:

Class Average = (Sum of all scores) ÷ (Total number of students)

Sum of scores = Average × Number of students

Calculation:

Sum of scores of first 12 students = 60 × 12 = 720

Sum of scores of remaining 18 students = 60 × 18 = 1080

Total sum of scores = 720 + 1080 = 1800

⇒ Class Average = 1800 ÷ 30 = 60

∴ The correct answer is option (2).

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