The average of 64,72,80 is MCQ with Answer and Explanation

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The average of 64,72,80 is

A. 70

B. 68

C. 75

D. 72

Answer: Option D

Solution (By JKExamLibrary)

216/3=72.

This question belongs to: Maths Average

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Question #1

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The average of 7 numbers is 41. If each number is multiplied by 2, what is the new average?

A. 84

B. 41

C. 61.5

D. 82

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Correct Answer: Option D

Explanation:
New average =41×2=82.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 520. If average of 8 is 515, average of remaining 4?

A. 525

B. 528

C. 530

D. 532

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Correct Answer: Option C

Explanation:
Sum12=6240. Sum8=4120. Remaining=2120. Average=530.

This question belongs to: Maths Average

Question #3

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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. 40

B. 45

C. 42

D. 39

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Correct Answer: Option C

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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