Question

if 6440 soldiers were asked to stand in rows to form a perfect square, it was found that 40 soldiers were left out. what was the number of soldiers in each row

Answer 1

6440-40=6400
$\sqrt{6400} = 80$

Answer 2

Find the number of soldiers in the perfect square:

Number of soldiers = 6440 - 40 = 6400

Find the number of soldiers in one row:

Since the area of a square is made up of length²

To find length, we square root the area.

Number of soldiers in one row = √6400 = 80

Answer: There are 80 soldiers in one row.