There are 400 students in the hall.
Given,
There are 20 students kept in each row and each column of a square hall.
We need to know how many students are in total in the square hall.
What is a square?
In a square all four sides are equal.
If we have a square hall then the number of rows and columns must be equal.
So we have 20 rows and 20 columns in the square hall.
Total number of students in the square hall
= Number of rows x number of columns
= 20 x 20
= 400 students
We can also find the total number of students by calculating the number of students in all the rows or in all the columns.
If one row = 20 students
then,
20 rows = 20 x 20 students = 400 students.
If one column = 20 students,
then,
20 columns = 20 x 20 students = 400 students.
Thus, the total number of students in the square hall is 400 students
Learn more about calculating the number of rows and columns problems here:
https://brainly.com/question/18830558
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