The average of 8 numbers is 40. If one number is 20, find the average of the remaining 7. MCQ with Answer and Explanation

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The average of 8 numbers is 40. If one number is 20, find the average of the remaining 7.

A. 42.86

B. 41.5

C. 42

D. 43

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum=8×40=320. Remaining sum=320-20=300. Avg=300/7=42.86.

This question belongs to: Maths Average

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Question #1

Average of 20, 40, 60, 80 is

A. 50

B. 45

C. 55

D. 60

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Correct Answer: Option A

Explanation:
Sum=200. Average=50.

This question belongs to: Maths Average

Question #2

What is the average of the first 6 prime numbers?

A. 6.33

B. 6.5

C. 7

D. 6.83

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Correct Answer: Option D

Explanation:
Primes:2,3,5,7,11,13 sum=41, avg=41/6=6.83.

This question belongs to: Maths Average

Question #3

Average of 9 numbers 1340. If average of 6 is 1335, average of remaining 3?

A. 1345

B. 1350

C. 1348

D. 1355

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Correct Answer: Option B

Explanation:
Sum9=12060. Sum6=8010. Remaining=4050. Average=1350.

This question belongs to: Maths Average

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