Average of 15 numbers 410. If average of 9 is 405, average of remaining 6? MCQ with Answer and Explanation

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Average of 15 numbers 410. If average of 9 is 405, average of remaining 6?

A. 418

B. 415

C. 417.5

D. 420

Answer: Option C

Solution (By JKExamLibrary)

Sum15=6150. Sum9=3645. Remaining=2505. Average=417.5.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 10 numbers 35. If average of 6 is 30, average of remaining 4?

A. 42.5

B. 43

C. 45

D. 40

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Correct Answer: Option A

Explanation:
Sum10=350. Sum6=180. Remaining=170. Average=42.5.

This question belongs to: Maths Average

Question #2 Report Error

Average of 20 numbers is 45. If 5 numbers with average 50 are removed, new average?

A. 43.33

B. 42

C. 45

D. 44

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Correct Answer: Option A

Explanation:
Sum20=900. Sum5=250. Remaining sum=650. Numbers15. Average≈43.33.

This question belongs to: Maths Average

Question #3 Report Error

Average marks of boys 60, girls 70, total average 65. Ratio boys:girls?

A. 3:1

B. 2:1

C. 1:1

D. 1:2

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Let b,g. 60b +70g =65(b+g). 5g=5b. b=g.

This question belongs to: Maths Average

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