If average of 4 numbers is 25 and three numbers 20,25,35, fourth? MCQ with Answer and Explanation

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If average of 4 numbers is 25 and three numbers 20,25,35, fourth?

A. 20

B. 15

C. 25

D. 30

Answer: Option A

Solution (By JKSSB Mock Tests)

Fourth=100 -80=20.

This question belongs to: Maths Average

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Question #1

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The average of squares of first 4 natural numbers is

A. 9

B. 8.5

C. 7.5

D. 6.5

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Correct Answer: Option C

Explanation:
(1+4+9+16)/4=30/4=7.5.

This question belongs to: Maths Average

Question #2

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The average age of 8 students is 15 years. If the teacher's age is included, the average becomes 18 years. What is the teacher's age?

A. 42

B. 40

C. 45

D. 39

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Correct Answer: Option A

Explanation:
Total age of students = 8×15 = 120. Total age including teacher = 9×18 = 162. Teacher's age = 162−120 = 42.

This question belongs to: Maths Average

Question #3

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The average of 10, 20, 30 is 20, average of 30,40,50 is 40, average of 10,20,30,40,50 is

A. 32

B. 30

C. 35

D. 28

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Correct Answer: Option B

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

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