Average of 10 numbers 280. If average of 6 is 275, average of remaining 4? MCQ with Answer and Explanation

Average of 10 numbers 280. If average of 6 is 275, average of remaining 4?

A. 287.5

B. 285

C. 286

D. 290

Answer: Option A

Sum10=2800. Sum6=1650. Remaining=1150. Average=287.5.

This question belongs to: Maths Average

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Question #1 Report Error

In a class of 40 students, average marks in Maths is 65. If average of 10 students is 80, what is average of remaining?

A. 58

B. 62

C. 55

D. 60

Correct Answer: Option D

Explanation:
Total marks = 40×65=2600. Marks of 10=10×80=800. Remaining marks=1800. Average=1800/30=60.

This question belongs to: Maths Average

Question #2 Report Error

Average of 30 numbers 20. If each decreased by 4, new average?

A. 20

B. 16

C. 18

D. 24

Correct Answer: Option B

Explanation:
16.

This question belongs to: Maths Average

Question #3 Report Error

Average of 15 numbers 860. If average of 9 is 855, average of remaining 6?

A. 868

B. 865

C. 867.5

D. 870

Correct Answer: Option C

Explanation:
Sum15=12900. Sum9=7695. Remaining=5205. Average=867.5.

This question belongs to: Maths Average