The average weight of 10 students is 45 kg. If a new student joins, the average becomes 46 kg. What is the weight of the new student? MCQ with Answer and Explanation

Question

The average weight of 10 students is 45 kg. If a new student joins, the average becomes 46 kg. What is the weight of the new student?

A. 55 kg

B. 56 kg

C. 57 kg

D. 54 kg

Answer: Option B

Solution (By JKSSB Mock Tests)

Total weight of 10 = 450. Total of 11 = 11×46=506. New student's weight = 506-450=56.

This question belongs to: Maths Average

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The average of 10 numbers is 22. If each number is decreased by 2, what is the new average?

A. 24

B. 22

C. 20

D. 18

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Correct Answer: Option C

Explanation:
New average =22-2=20.

This question belongs to: Maths Average

Question #2

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Average of 495,660,825 is

A. 660

B. 655

C. 670

D. 650

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Correct Answer: Option A

Explanation:
1980/3=660.

This question belongs to: Maths Average

Question #3

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Find the average of prime numbers between 20 and 40.

A. 28

B. 29

C. 30

D. 31

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Correct Answer: Option B

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.]

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