Question

for a physical training session,students are made to stand in a grid with 4 students in a row.express the number of students in terms of the number of row 'r'.

Answer 1

Number of rows in the grid = r
number of students in a row = 4
total number of students = 4×r = 4r

Answer 2

let the number of row =x
the number of students in each row =4 students
the total number of students = 4x