Average of 18 numbers 50. If 6 numbers average 55, average of remaining 12? MCQ with Answer and Explanation

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Average of 18 numbers 50. If 6 numbers average 55, average of remaining 12?

A. 47.5

B. 45

C. 48

D. 46

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum18=900. Sum6=330. Remaining=570/12=47.5.

This question belongs to: Maths Average

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Question #1

Find the average of the first 7 natural numbers which are multiples of 2.

A. 8.5

B. 8

C. 9

D. 7

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Correct Answer: Option B

Explanation:
Multiples: 2,4,6,8,10,12,14 sum=56, count=7, avg=8.

This question belongs to: Maths Average

Question #2

Average of 20 numbers 50. If each number is doubled, new average?

A. 75

B. 50

C. 25

D. 100

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Correct Answer: Option D

Explanation:
New average =100.

This question belongs to: Maths Average

Question #3

What is average of all multiples of 7 from 7 to 70?

A. 38.5

B. 38

C. 35

D. 39

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Correct Answer: Option A

Explanation:
Multiples: 7,14,...,70 (10 numbers). Average=(7+70)/2=38.5.

This question belongs to: Maths Average

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