The average weight of 10 persons is 70 kg. If a person weighing 80 kg leaves, what is the new average? MCQ with Answer and Explanation

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The average weight of 10 persons is 70 kg. If a person weighing 80 kg leaves, what is the new average?

A. 68.5

B. 69

C. 69.5

D. 68.89 kg

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum=10×70=700. New sum=700-80=620. New avg=620/9=68.89.

This question belongs to: Maths Average

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Question #1

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Average of 10 numbers 930. If average of 6 is 925, average of remaining 4?

A. 940

B. 936

C. 937.5

D. 935

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Correct Answer: Option C

Explanation:
Sum10=9300. Sum6=5550. Remaining=3750. Average=937.5.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 38. If average of 9 is 35, average of remaining 3?

A. 45

B. 47

C. 48

D. 50

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Correct Answer: Option B

Explanation:
Sum12=456. Sum9=315. Remaining=141. Average=47.

This question belongs to: Maths Average

Question #3

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The average of 6 numbers is 15. If each number is increased by 7, what is the new average?

A. 22

B. 29

C. 15

D. 8

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Correct Answer: Option A

Explanation:
New average =15+7=22.

This question belongs to: Maths Average

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