What is the average of the first 7 multiples of 5? MCQ with Answer and Explanation

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What is the average of the first 7 multiples of 5?

A. 15

B. 30

C. 20

D. 25

Answer: Option C

Solution (By JKSSB Mock Tests)

Multiples: 5,10,15,20,25,30,35 sum=140, count=7, avg=20.

This question belongs to: Maths Average

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Question #1

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Average weight of 40 students 45 kg. If 10 more with average 50 kg join, new average?

A. 46.25

B. 45

C. 47

D. 46

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Correct Answer: Option D

Explanation:
Total old=1800. New=500. Total 2300 for 50. Average=46.

This question belongs to: Maths Average

Question #2

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Average of 9 numbers 45. If average of first 5 is 42, average of last 5 is 48, 5th number?

A. 46

B. 45

C. 48

D. 42

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Correct Answer: Option B

Explanation:
Sum9=405. Sum1-5=210. Sum5-9=240. 5th=210+240-405=45.

This question belongs to: Maths Average

Question #3

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Average of 16 numbers 25. If 4 numbers average 30, average of remaining 12?

A. 23.33

B. 25

C. 22

D. 24

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Correct Answer: Option A

Explanation:
Sum16=400. Sum4=120. Remaining=280/12≈23.33.

This question belongs to: Maths Average

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