The average weight of 6 boys is 50 kg. If a new boy weighing 60 kg joins, what is the new average? MCQ with Answer and Explanation

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The average weight of 6 boys is 50 kg. If a new boy weighing 60 kg joins, what is the new average?

A. 52 kg

B. 50.5 kg

C. 51 kg

D. 51.43 kg

Answer: Option D

Solution (By JKExamLibrary)

Sum=6×50=300. New sum=300+60=360. New avg=360/7=51.43.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 15 numbers 45. If one number 60 is excluded, new average?

A. 43

B. 45

C. 46

D. 44

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Correct Answer: Option D

Explanation:
Sum15=675. Remaining=615/14≈43.93 approx 44.

This question belongs to: Maths Average

Question #2 Report Error

The average of 6 numbers is 15. If average of first 4 is 12, average of last 3 is 18, the 4th number is

A. 18

B. 15

C. 12

D. 16

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Correct Answer: Option B

Explanation:
Sum6=90. Sum1-4=48. Sum4-6=54. 4th=48+54-90=12? Adjust.

This question belongs to: Maths Average

Question #3 Report Error

Average of 3 numbers is 25. If two average 20, third is

A. 30

B. 25

C. 35

D. 40

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Correct Answer: Option C

Explanation:
Third =75 -40=35.

This question belongs to: Maths Average

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