Average of 12 numbers 2520. If average of 8 is 2515, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 2520. If average of 8 is 2515, average of remaining 4?

A. 2525

B. 2530

C. 2532

D. 2528

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum12=30240. Sum8=20120. Remaining=10120. Average=2530.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

What is the average of the first 12 even numbers?

A. 12.5

B. 13.5

C. 13

D. 14

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Correct Answer: Option C

Explanation:
Sum of first 12 even numbers = 12×13 =156 (since sum = n(n+1) for first n evens). Average=156/12=13.

This question belongs to: Maths Average

Question #2

The average marks of 12 students is 72. If one student scored 84 marks, what is the total marks of the remaining students?

A. 744

B. 780

C. 768

D. 720

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Correct Answer: Option B

Explanation:
Total marks = 12×72 = 864. Remaining students' marks = 864−84 = 780.

This question belongs to: Maths Average

Question #3

The average age of 8 students is 15 years. If the teacher's age is included, the average becomes 18 years. What is the teacher's age?

A. 39

B. 45

C. 40

D. 42

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Correct Answer: Option D

Explanation:
Total age of students = 8×15 = 120. Total age including teacher = 9×18 = 162. Teacher's age = 162−120 = 42.

This question belongs to: Maths Average

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