The equation that will tell him what the width of the rectangle can be is w = 50m² / length.
A rectangle is a 2-dimensional quadrilateral with four equal right angles. A rectangle has two diagonals that are equal in length and bisect each other.
Area of a rectangle = length x width
Width = area / length
width = 50m² / length.
To learn more about how to calculate the area of a rectangle, please check: https://brainly.com/question/16595449