Average of 20, 40, 60, 80 is MCQ with Answer and Explanation

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Average of 20, 40, 60, 80 is

A. 55

B. 60

C. 45

D. 50

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum=200. Average=50.

This question belongs to: Maths Average

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Question #1

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The average of 5 numbers is 40. If each number is decreased by 5, what is the new average?

A. 35

B. 30

C. 45

D. 40

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Correct Answer: Option A

Explanation:
If each number is decreased by a constant, the average also decreases by that constant. New average =40-5=35.

This question belongs to: Maths Average

Question #2

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Average speed for equal distances at 40 km/h and 60 km/h is

A. 45 km/h

B. 55 km/h

C. 50 km/h

D. 48 km/h

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Correct Answer: Option D

Explanation:
Harmonic mean for equal distance: 2×40×60 / (40+60) = 4800/100 = 48 km/h.

This question belongs to: Maths Average

Question #3

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The average of 930,1240,1550 is

A. 1235

B. 1250

C. 1240

D. 1230

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Correct Answer: Option C

Explanation:
3720/3=1240.

This question belongs to: Maths Average

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