Average of 10 numbers 1280. If average of 6 is 1275, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 1280. If average of 6 is 1275, average of remaining 4?

A. 1290

B. 1287.5

C. 1286

D. 1285

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum10=12800. Sum6=7650. Remaining=5150. Average=1287.5.

This question belongs to: Maths Average

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Question #1

Average of all odd numbers from 1 to 49 is

A. 23

B. 26

C. 25

D. 24

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Correct Answer: Option C

Explanation:
25 numbers. Average 25.

This question belongs to: Maths Average

Question #2

The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is:

A. 64

B. 68

C. 65

D. 66

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Correct Answer: Option D

Explanation:
Combined average = (20×60 + 30×70)/50 = 3300/50 = 66.

This question belongs to: Maths Average

Question #3

Average of 20,30,40,50,60 is

A. 40

B. 45

C. 38

D. 42

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Correct Answer: Option A

Explanation:
Sum=200. Average=40.

This question belongs to: Maths Average

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