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There are N students in a class. Their class teacher gave them a task of finding the average of first N natural numbers and each of them left out a different number and found the average of the remaining numbers. The average of the averages obtained by all the students was 21. Find N.

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please anyone tell how to solve the below questions

A dishonest dealer sells the goods at 6.25% loss on cost price but uses 12.5% less weight. What is his percentage profit or loss?

A dishonest dealer sells goods at 6.25% loss on cost price but uses 14 gm instead of 16 gm.
what is his percentage profit or loss?

in hindi

The Humanities department of Mumbai University has six professors (Mr Advani, Mr Bhushan, Mr Chargaonkar, Mr Dube, Mr Emerson and Mrs Falguni) whose 6 offices are arranged as shown in the diagram. The six professor teach, in no particular order, Communication Skills, Sociology, Anthropology, Organizational Behavior, Linguistics and Critical Thinking. Abhay wants to meet these professors and knows the following about the locations of their offices.

1. Mr Advani's office is on the same side as the Organisational Behaviour professor's office but is further away from the entrance

2. On entering the wing, the Sociology professor's office is on the left side of the hallway and is opposite Mrs Falguni's office

3. The Anthropology professor's office is on the same side as Mr Bhushan's office but is closer to the entrance

4 The Critical Reasoning professor's office is on the same side as Linguistics professor's office but is closer to the entrance

5. On entering the wing, Mr Advani's office would be on the left hand side and opposite to the Critical Reasoning professors office

6/Mr Dube's office is on the same side as Mr Emerson's office but is closer to the entrance

7. The Communication Skills professor's office is further down the hallway and on the same side as the Sociology professor's office

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