The average of first 6 multiples of 7 is MCQ with Answer and Explanation

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The average of first 6 multiples of 7 is

A. 25

B. 28

C. 24.5

D. 21

Answer: Option C

Solution (By JKSSB Mock Tests)

7*(1+6)/2=7*3.5=24.5.

This question belongs to: Maths Average

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Question #1

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Average of 25 students marks 80. If 5 students average 90, average of remaining 20?

A. 77.5

B. 75

C. 78

D. 76

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Correct Answer: Option A

Explanation:
Total=2000. 5=450. Remaining=1550/20=77.5.

This question belongs to: Maths Average

Question #2

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The average of 4 numbers is 16. If one number is 24, find the average of the other three.

A. 13.33

B. 12

C. 13

D. 14

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Correct Answer: Option A

Explanation:
Sum=4×16=64. Other sum=64-24=40. Avg=40/3=13.33.

This question belongs to: Maths Average

Question #3

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Average of 25 numbers 40. If average of first 13 is 38, average of last 13 is 42, what is the 13th number?

A. 40

B. 39

C. 38

D. 42

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Correct Answer: Option A

Explanation:
Sum25=1000. Sum1-13=494. Sum13-25=546. 13th=494+546-1000=40.

This question belongs to: Maths Average

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