Average of 20 numbers 48. If two numbers 40 and 60 replaced by 50 and 70, new average? MCQ with Answer and Explanation

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Average of 20 numbers 48. If two numbers 40 and 60 replaced by 50 and 70, new average?

A. 47

B. 50

C. 49

D. 48

Answer: Option C

Solution (By JKSSB Mock Tests)

Net +20, increase 1. New=49.

This question belongs to: Maths Average

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Question #1

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Average of 945,1260,1575 is

A. 1250

B. 1270

C. 1255

D. 1260

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Correct Answer: Option D

Explanation:
3780/3=1260.

This question belongs to: Maths Average

Question #2

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The average weight of 20 boys is 60 kg. If one boy weighing 80 kg leaves, what is the average weight of the remaining boys?

A. 58.95 kg

B. 59 kg

C. 61 kg

D. 60 kg

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Correct Answer: Option A

Explanation:
Total weight = 20×60 = 1200 kg. Remaining weight = 1200−80 = 1120 kg. Average = 1120/19 = 58.95 kg.

This question belongs to: Maths Average

Question #3

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What is the average of the first 6 multiples of 2?

A. 6

B. 8

C. 7

D. 9

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Correct Answer: Option C

Explanation:
Multiples:2,4,6,8,10,12 sum=42, count=6, avg=7.

This question belongs to: Maths Average

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