Answer:
Width of rectangle playing field = W = 42 yards
Explanation:
Given Data:
Length of rectangle playing field = L = 100

Area of rectangle playing field = A = 4200

To find out:
Width of rectangle = W = ?
Formula:
Area = A = L×W
Width of rectangle playing field = W = A/L
Solution:
Width of rectangle playing field = W = A/L
Width of rectangle playing field = W = 4200/100
Width of rectangle playing field = W = 42
