The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is: MCQ with Answer and Explanation

Question

The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is:

A. 66

B. 64

C. 68

D. 65

Answer: Option A

Solution (By JKSSB Mock Tests)

Combined average = (20×60 + 30×70)/50 = 3300/50 = 66.

This question belongs to: Maths Average

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Question #1

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If average of 10 numbers is 20 and average of 6 is 18, average of remaining 4?

A. 24

B. 22

C. 23

D. 25

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Correct Answer: Option C

Explanation:
Sum10=200. Sum6=108. Remaining=92. Average=23.

This question belongs to: Maths Average

Question #2

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The average of 20,25,30,35,40 is

A. 31

B. 32

C. 30

D. 28

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Correct Answer: Option C

Explanation:
Sum=150. Average=30.

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Question #3

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Average of 4,8,12,...,36 is

A. 18

B. 22

C. 24

D. 20

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Correct Answer: Option D

Explanation:
9 numbers. Average=(4+36)/2=20.

This question belongs to: Maths Average

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