Question at position 1 How is population density determined?Total area divided by the number of people living in that area.Total number of people living in an area multiplied by the size of the area. Total number of people living in an area divided by the size of the area.Total area multiplied by the number of people living in that area.

Question

Question at position 1 How is population density determined?Total area divided by the number of people living in that area.Total number of people living in an area multiplied by the size of the area. Total number of people living in an area divided by the size of the area.Total area multiplied by the number of people living in that area.

BlackTom AI · Accepted Answer

Population density is defined as the number of people per unit area, so the correct operation is division: total population ÷ area.

1. Relevant knowledge points and concepts
- Population density measures how crowded an area is and is expressed as people per unit area (for example, people per square kilometer or people per square mile).
- The mathematical form is density = population / area. This yields units of “people per unit area,” which is meaningful for comparisons.

2. Complete reasoning process step by step
- Identify the two quantities involved: total number of people (a count) and size of the area (a measure of space).
- To express how many people occupy each unit of area, divide the count of people by the amount of area available.
- This yields a per-unit value: for each square kilometer (or other unit), how many people live there?

3. Calculation example with intermediate steps
- Example: A town has 1,200 people and covers 3 square kilometers.
  Step 1: population = 1,200 people.
  Step 2: area = 3 km².
  Step 3: density = population ÷ area = 1,200 ÷ 3.
  Step 4: 1,200 ÷ 3 = 400.
  Result: 400 people per km².

4. Why the correct answer is correct
- Division yields the “per” relationship required by density (people per area). It produces a meaningful unit (people/unit area) and allows direct comparison across regions of different sizes.

5. Why the other options are incorrect
- "Total area divided by number of people": inverts the relationship and gives area per person (area/person), not population density.
- "Total number of people multiplied by the size of the area": produces people·area (nonsensical unit), exaggerating the measure and not giving a per-area rate.
- "Total area multiplied by the number of people": also yields an incorrect compound unit (area·people) and does not describe people per area.

6. Conclusion
- The correct choice is "Total number of people living in an area divided by the size of the area." This matches the provided answer.

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