If the average of 8 numbers is 22 and average of 4 is 20, average of other 4 is MCQ with Answer and Explanation

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If the average of 8 numbers is 22 and average of 4 is 20, average of other 4 is

A. 24

B. 23

C. 26

D. 22

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum8=176. Sum4=80. Other sum=96. Average=24.

This question belongs to: Maths Average

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Question #1

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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. 39

B. 40

C. 45

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

Question #2

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Average of 15 numbers 1760. If average of 9 is 1755, average of remaining 6?

A. 1770

B. 1765

C. 1767.5

D. 1768

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Correct Answer: Option C

Explanation:
Sum15=26400. Sum9=15795. Remaining=10605. Average=1767.5.

This question belongs to: Maths Average

Question #3

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Average of 1515,2020,2525 is

A. 2020

B. 2030

C. 2015

D. 2010

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Correct Answer: Option A

Explanation:
6060/3=2020.

This question belongs to: Maths Average

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