Answer:
Let’s assume that the distance between each tent and the fire is x. If they reposition the tents so that they are twice as far from the fire, then the distance between each tent and the fire will be 2x. The area of the campsite is proportional to the square of the distance between each tent and the fire. Therefore, if they reposition the tents so that they are twice as far from the fire, then the area of the campsite will be 4 times bigger than before.