Average of 10 numbers 480. If average of 6 is 475, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 480. If average of 6 is 475, average of remaining 4?

A. 487.5

B. 485

C. 486

D. 490

Answer: Option A

Solution (By JKExamLibrary)

Sum10=4800. Sum6=2850. Remaining=1950. Average=487.5.

This question belongs to: Maths Average

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Question #1 Report Error

Average height of 30 boys 160 cm. If 5 more with average 170 cm, new average?

A. 160

B. 162

C. 163

D. 161.43

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Correct Answer: Option D

Explanation:
Total old=4800. New=850. Total 5650 /35≈161.43.

This question belongs to: Maths Average

Question #2 Report Error

The average weight of 20 boys is 60 kg. If one boy weighing 80 kg leaves, what is the average weight of the remaining boys?

A. 60 kg

B. 61 kg

C. 59 kg

D. 58.95 kg

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Correct Answer: Option D

Explanation:
Total weight = 20×60 = 1200 kg. Remaining weight = 1200−80 = 1120 kg. Average = 1120/19 = 58.95 kg.

This question belongs to: Maths Average

Question #3 Report Error

A group of 5 friends average age 25. If one leaves, average becomes 24. Age of person who left?

A. 29

B. 30

C. 28

D. 31

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum5=125. Sum4=96. Left=29.

This question belongs to: Maths Average

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