In aid of charity every student in a class contributes as many rupees as the number of students in t...........

Math and Mental Ability Simplification

In aid of charity, every student in a class contributes as many rupees as the number of students in that class. With the additional contribution of Rs. 2 by one student only, the total collection is Rs. 443. Then how many students are there in the class?

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Explanation:

Total collection = Rs 443.
Total collection of the class - additional contribution = 443 - 2 = Rs 441
Every student contributed an amount equal to total number of students.
Let total number of students in the class be N. So, N ² = 441
Hence, N = 21.