Average of 8 numbers 250. If average of 5 is 245, average of remaining 3? MCQ with Answer and Explanation

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Average of 8 numbers 250. If average of 5 is 245, average of remaining 3?

A. 258.33

B. 255

C. 260

D. 257

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum8=2000. Sum5=1225. Remaining=775. Average≈258.33.

This question belongs to: Maths Average

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Question #1

The average of 55,65,75 is

A. 70

B. 68

C. 60

D. 65

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Correct Answer: Option D

Explanation:
195/3=65.

This question belongs to: Maths Average

Question #2

The average weight of 8 persons increases by 2.5 kg when one person weighing 65 kg is replaced by a new person. What is the weight of the new person?

A. 85

B. 75

C. 90

D. 80

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Correct Answer: Option A

Explanation:
Increase in total weight = 8 × 2.5 = 20 kg. New person weight = 65 + 20 = 85 kg.

This question belongs to: Maths Average

Question #3

What is the average of the first 7 multiples of 5?

A. 25

B. 30

C. 20

D. 15

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Correct Answer: Option C

Explanation:
Multiples: 5,10,15,20,25,30,35 sum=140, count=7, avg=20.

This question belongs to: Maths Average

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