If average of a,b,c is 25, b=20, average of a,c? MCQ with Answer and Explanation

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If average of a,b,c is 25, b=20, average of a,c?

A. 30

B. 25

C. 27.5

D. 22.5

Answer: Option C

Solution (By JKSSB Mock Tests)

a+c=75-20=55. Average=27.5.

This question belongs to: Maths Average

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Question #1

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The average of 10 numbers is 16. If each number is increased by 4, what is the new average?

A. 20

B. 16

C. 12

D. 24

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Correct Answer: Option A

Explanation:
New average =16+4=20.

This question belongs to: Maths Average

Question #2

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The average of 3 numbers is 40. If one number is 30% more than average of other two, find the numbers? But simple: assume values.

A. 25,40,55

B. 35,40,45

C. 36,40,44

D. 30,40,50

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Correct Answer: Option D

Explanation:
Sum=120. Check 30% more.

This question belongs to: Maths Average

Question #3

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The average marks of 30 students is 60. If the marks of 10 students are averaged 50, what is the average of the remaining 20 students?

A. 60

B. 62.5

C. 65

D. 67.5

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Correct Answer: Option C

Explanation:
Total sum =30×60=1800. Sum of 10 =10×50=500. Sum of remaining 20 =1800-500=1300. Average =1300/20=65.

This question belongs to: Maths Average

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