The average age of 10 friends is 25. If one 30 years old joins, new average? MCQ with Answer and Explanation

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The average age of 10 friends is 25. If one 30 years old joins, new average?

A. 25.5

B. 24.5

C. 25.45

D. 26

Answer: Option C

Solution (By JKSSB Mock Tests)

Total=250. New=280/11≈25.45.

This question belongs to: Maths Average

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Question #1

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Average of 4 numbers is 50. If three are 40,45,55, fourth is

A. 65

B. 60

C. 55

D. 50

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Correct Answer: Option B

Explanation:
Fourth=200-140=60.

This question belongs to: Maths Average

Question #2

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Average of 22,33,44,55 is

A. 38.5

B. 36

C. 40

D. 39

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Correct Answer: Option A

Explanation:
Sum=154. Average=38.5.

This question belongs to: Maths Average

Question #3

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The average of 990,1320,1650 is

A. 1320

B. 1310

C. 1330

D. 1315

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Correct Answer: Option A

Explanation:
3960/3=1320.

This question belongs to: Maths Average

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