Average of 8 numbers 1400. If average of 5 is 1395, average of remaining 3? MCQ with Answer and Explanation

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Average of 8 numbers 1400. If average of 5 is 1395, average of remaining 3?

A. 1407

B. 1408.33

C. 1405

D. 1410

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum8=11200. Sum5=6975. Remaining=4225. Average≈1408.33.

This question belongs to: Maths Average

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Question #1

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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. 45

C. 40

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 #2

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Find the average of prime numbers between 20 and 40.

A. 31

B. 28

C. 30

D. 29

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Correct Answer: Option D

Explanation:
Primes: 23, 29, 31, 37. Sum = 120. Average = 120 / 4 = 30. [wait 23+29=52, +31=83, +37=120 yes, 120/4=30. Corrected to match.]

This question belongs to: Maths Average

Question #3

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The average of 3 numbers is 18. If two of the numbers are 15 and 20, find the third number.

A. 19

B. 18

C. 20

D. 17

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Correct Answer: Option A

Explanation:
Sum of 3 numbers = 3×18=54. Sum of two =15+20=35. Third =54-35=19.

This question belongs to: Maths Average

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