Find the average of all numbers divisible by 5 between 10 and 30 (inclusive). MCQ with Answer and Explanation

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Find the average of all numbers divisible by 5 between 10 and 30 (inclusive).

A. 20

B. 22.5

C. 20.5

D. 17.5

Answer: Option A

Solution (By JKSSB Mock Tests)

Numbers: 10,15,20,25,30 sum=100, count=5, avg=20.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Find the average of the first 7 natural numbers which are multiples of 2.

A. 8.5

B. 7

C. 9

D. 8

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Correct Answer: Option D

Explanation:
Multiples: 2,4,6,8,10,12,14 sum=56, count=7, avg=8.

This question belongs to: Maths Average

Question #2

What is the average of the first 9 odd numbers?

A. 9.5

B. 8.5

C. 9

D. 10

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Correct Answer: Option C

Explanation:
Sum of first n odd numbers = n^2 =9^2=81. Average=81/9=9.

This question belongs to: Maths Average

Question #3

Average marks of boys 60, girls 70, total average 65. Ratio boys:girls?

A. 1:1

B. 2:1

C. 1:2

D. 3:1

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Correct Answer: Option A

Explanation:
Let b,g. 60b +70g =65(b+g). 5g=5b. b=g.

This question belongs to: Maths Average

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