Cora measured a farm and made a scale drawing. The scale of the drawing was 2 millimeters : 1 meter. If the actual width of the goat pen is 4 meters, how wide is the pen in the drawing?
Since the scale of the drawing is 2 millimeters: 1 meter, and the actual width of the goat pen is 4 meters, the width of the pen in the drawing would be 4 meters x 2 millimeters/meter = <<4*2=8>>8 millimeters. Answer: \boxed{8}.
