Average of 25 numbers 80. If average of 10 is 85, average of remaining 15? MCQ with Answer and Explanation

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Average of 25 numbers 80. If average of 10 is 85, average of remaining 15?

A. 76.67

B. 75

C. 78

D. 77

Answer: Option A

Solution (By JKExamLibrary)

Total=2000. Sum10=850. Remaining=1150/15≈76.67.

This question belongs to: Maths Average

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Question #1

What is the average of the first 5 prime numbers?

A. 6.0

B. 5.6

C. 5.8

D. 5.4

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Correct Answer: Option B

Explanation:
Primes: 2,3,5,7,11 sum=28, avg=28/5=5.6.

This question belongs to: Maths Average

Question #2

Average of 30,60,90,120 is

A. 75

B. 85

C. 80

D. 70

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Correct Answer: Option A

Explanation:
300/4=75.

This question belongs to: Maths Average

Question #3

The average of 3 numbers is 15. If each number is multiplied by 2, what is the new average?

A. 30

B. 15

C. 45

D. 60

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Correct Answer: Option A

Explanation:
New average =15×2=30.

This question belongs to: Maths Average

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