Average of 40 numbers 55. If 10 numbers average 65, average of remaining 30? MCQ with Answer and Explanation

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Average of 40 numbers 55. If 10 numbers average 65, average of remaining 30?

A. 53

B. 52

C. 50

D. 51.67

Answer: Option D

Solution (By JKSSB Mock Tests)

Total=2200. 10=650. Remaining=1550/30≈51.67.

This question belongs to: Maths Average

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Question #1

Average of 15 numbers 28. If one number 40 is replaced by 25, new average?

A. 27.5

B. 28

C. 26.67

D. 27

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Correct Answer: Option D

Explanation:
Change -15, decrease 1. New=27.

This question belongs to: Maths Average

Question #2

Average of 12 numbers is 40. If average of first 7 is 38, what is average of last 5?

A. 43

B. 44

C. 40

D. 42

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Correct Answer: Option A

Explanation:
Sum12=480. Sum first7=266. Sum last5=214. Average last5=42.8 ≈ but use exact numbers.

This question belongs to: Maths Average

Question #3

Average of 4 numbers a,b,c,d. If a+b=50, c+d=70, average?

A. 30

B. 35

C. 28

D. 25

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Correct Answer: Option A

Explanation:
Sum=120. Average=30.

This question belongs to: Maths Average

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