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I want 2025 pyqs

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.

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?