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Modular Arithmetic and Congruence Modulo

81 students i...

Question

81 students in a class are to be arranged in 9 rows for a procession. How many students will be there in each row?

A

12

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B

7

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C

9

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D

6

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Solution

The correct option is C 9
Total number of students = 81
Number of rows = 9
So, to find the number of students in each row, we have to divide 81 by 9.
From the multiplication table of 9, we know that 9 $\times$ 9 = 81.
Since division is the reverse of multiplication,
81 $\div$ 9 = 9
Thus, each row will have 9 students.

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