Answer: 31 people per square mile
Explanation: First we need to find the area of the rectangle (A=lw), which is 120*80 or 9600 square miles.
To find population density, we take the number of people and divided by square miles in this case (300,000/9600).
We then get 125/4 or 31.25.
Rounding to the nearest whole number gives us a population density 31 people per square mile