Average marks of class 48. If 5 students 60 average, 5 students 30 average, overall? MCQ with Answer and Explanation

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Average marks of class 48. If 5 students 60 average, 5 students 30 average, overall?

A. 45

B. 50

C. 47

D. 48

Answer: Option D

Solution (By JKSSB Mock Tests)

Net same.

This question belongs to: Maths Average

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Question #1

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What is the average of all odd numbers from 1 to 19?

A. 10.5

B. 9

C. 9.5

D. 10

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Correct Answer: Option D

Explanation:
Odd numbers: 1,3,5,...,19. There are 10 terms. Sum = n^2 =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 470. If average of 8 is 465, average of remaining 4?

A. 475

B. 478

C. 480

D. 482

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Correct Answer: Option C

Explanation:
Sum12=5640. Sum8=3720. Remaining=1920. Average=480.

This question belongs to: Maths Average

Question #3

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Average of 18 numbers 60. If 6 numbers average 70, average of remaining 12?

A. 56

B. 50

C. 58

D. 55

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Correct Answer: Option D

Explanation:
Total=1080. 6=420. Remaining=660/12=55.

This question belongs to: Maths Average

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