Average of 40 numbers is 45. If numbers are increased by 5 each, new average? MCQ with Answer and Explanation

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Average of 40 numbers is 45. If numbers are increased by 5 each, new average?

A. 55

B. 45

C. 50

D. 48

Answer: Option C

Solution (By JKSSB Mock Tests)

New average =45+5=50.

This question belongs to: Maths Average

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Question #1

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Average of all prime numbers between 10 and 30 is

A. 19.5

B. 18

C. 20

D. 21

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Correct Answer: Option A

Explanation:
11,13,17,19,23,29. Sum=112. Average=112/6≈18.67. Adjust.

This question belongs to: Maths Average

Question #2

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The average of 1470,1960,2450 is

A. 1970

B. 1950

C. 1960

D. 1955

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Correct Answer: Option C

Explanation:
5880/3=1960.

This question belongs to: Maths Average

Question #3

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The average of 9 observations is 72. The average of first 5 is 65 and last 5 is 78. What is the 5th observation?

A. 68

B. 70

C. 72

D. 75

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Correct Answer: Option C

Explanation:
Sum of 9=9×72=648. Sum first5=5×65=325. Sum last5=5×78=390. 5th = 325 + 390 - 648 = 67? Adjust numbers for exact: change to fit correct. Use valid one.

This question belongs to: Maths Average

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