Average of 10 numbers 2380. If average of 6 is 2375, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 2380. If average of 6 is 2375, average of remaining 4?

A. 2390

B. 2385

C. 2386

D. 2387.5

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum10=23800. Sum6=14250. Remaining=9550. Average=2387.5.

This question belongs to: Maths Average

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Question #1

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If the average of 5 numbers is 60 and the average of first two is 55, average of last two is 65, then the middle number is

A. 70

B. 55

C. 65

D. 60

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Correct Answer: Option D

Explanation:
Sum5=300. Sum first2=110. Sum last2=130. Middle=300-240=60.

This question belongs to: Maths Average

Question #2

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The average age of 25 persons is 36. If 5 persons with average 40 leave, new average?

A. 36

B. 34

C. 37

D. 35

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Correct Answer: Option D

Explanation:
Total=900. Leave=200. Remaining 700/20=35.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 38. If one number 50 replaced by 20, new average?

A. 36

B. 36.67

C. 37

D. 35

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Correct Answer: Option B

Explanation:
Change -30, decrease 2. New≈36.

This question belongs to: Maths Average

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