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A teacher gave sum to his class to find ...

A teacher gave sum to his class to find the average of n numbers viz. 1,2,3,4,5,6,… etc. but when the teacher checked the solution, he has found that during the calculation a student just missed a number for the addition thus his average of the n number was 15. The value of n is :

A

30

B

26

C

31

D

not unique

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The correct Answer is:
D
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ARIHANT SSC-AVERAGES-Exercise (Level 2)
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  2. In a combined family the average age of 4 males and 7females is 42 and...

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  3. A teacher gave sum to his class to find the average of n numbers viz. ...

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  4. The average earning of a group of persons is ₹ 50 per day. The differe...

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  5. There are three categories of jobs A,B and c . The average salary of t...

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  6. Out of the five intergral number C is the average of A and D. B is gr...

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  7. The average age of Donald his wife and their two children is 23 years....

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  8. There are only five people in the Aman verma's family aman his wife a ...

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  9. The average weight of political party is decreased by 1 when some new ...

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  10. Ravi went to Kanpur from Lucknow by his four wheeler. During the journ...

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  11. There are 6 consecutive odd numbers in increasing order. The differenc...

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  12. The average age of board of directors of a company having 10 directors...

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  13. In an office the average weight of 24 employees is 60 kg. If n employ...

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  14. The average age of 100 nurses in a nursing home in 1982 was 50 years i...

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  15. Bhartiya Idol is a talent search programme launched and run by TV Tara...

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  16. A student has to secure 36% marks to pass. He gets 150 marks and fails...

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  17. Bhartiya Idol is a talent search programme launched and run by TV Tara...

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  18. If 75% of students in a school are boys and the number of girls is 310...

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  19. It is known that 6% of the mangoes are rotten. If the number of rotten...

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  20. In an NGO the daily average wages of 20 illiterate employees is decrea...

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