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? MCQ with Answer and Explanation

Question

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. 58.95 kg

B. 60 kg

C. 59 kg

D. 61 kg

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 1710. If average of 9 is 1705, average of remaining 6?

A. 1720

B. 1715

C. 1717.5

D. 1718

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Correct Answer: Option C

Explanation:
Sum15=25650. Sum9=15345. Remaining=10305. Average=1717.5.

This question belongs to: Maths Average

Question #2

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The average age of 5 children is 12. If parents average 40, average of all 7?

A. 20

B. 22

C. 25

D. 18

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Correct Answer: Option A

Explanation:
Children total=60. Parents=80. Total=140. Average=20.

This question belongs to: Maths Average

Question #3

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The average weight of 25 students is 50 kg. If the weight of teacher is included, average increases by 1 kg. What is teacher's weight?

A. 74

B. 80

C. 75

D. 76

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Correct Answer: Option D

Explanation:
Total students weight=1250. New total for 26=26×51=1326. Teacher=1326-1250=76 kg.

This question belongs to: Maths Average

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