Average of 10 numbers 1380. If average of 6 is 1375, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 1380. If average of 6 is 1375, average of remaining 4?

A. 1390

B. 1387.5

C. 1385

D. 1386

Answer: Option B

Solution (By JKExamLibrary)

Sum10=13800. Sum6=8250. Remaining=5550. Average=1387.5.

This question belongs to: Maths Average

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Question #1

Find the average of the first 5 composite numbers.

A. 7.6

B. 7.4

C. 8

D. 6.8

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Correct Answer: Option B

Explanation:
First 5 composites: 4,6,8,9,10 sum=37, avg=37/5=7.4.

This question belongs to: Maths Average

Question #2

The average of 9 numbers is 35. If each number is decreased by 5, what is the new average?

A. 25

B. 35

C. 40

D. 30

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Correct Answer: Option D

Explanation:
New average =35-5=30.

This question belongs to: Maths Average

Question #3

The average of 5 numbers is 28. If one number is excluded, the average becomes 25. What is the excluded number?

A. 30

B. 40

C. 35

D. 45

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Correct Answer: Option B

Explanation:
Sum of 5 numbers = 5 × 28 = 140. Sum of remaining 4 numbers = 4 × 25 = 100. Excluded number = 140 - 100 = 40.

This question belongs to: Maths Average

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