What is the average of the first 5 composite numbers? MCQ with Answer and Explanation

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What is the average of the first 5 composite numbers?

A. 7.4

B. 7.2

C. 8.0

D. 7.6

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Average

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Question #1

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Average speed to cover a distance in two equal parts at speeds x and y is

A. 2xy/(x+y)

B. (x+y)/2

C. xy/(x+y)

D. x+y

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Correct Answer: Option A

Explanation:
Harmonic mean for equal distances.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 38. If average of 9 is 35, average of remaining 3?

A. 50

B. 45

C. 47

D. 48

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Correct Answer: Option C

Explanation:
Sum12=456. Sum9=315. Remaining=141. Average=47.

This question belongs to: Maths Average

Question #3

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Average of 10 even numbers is 25. What is the largest if they are consecutive?

A. 30

B. 34

C. 32

D. 36

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Correct Answer: Option B

Explanation:
Average middle average of 5th and 6th. Largest =25 +9 =34.

This question belongs to: Maths Average

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