Question

The population of san francisco is 750,000 in an area of 49 square miles. what is the population density in san francisco? express your answer in people per acre. (1 mi2 = 640 acres)

Answer 1

For this case we have the following conversion factor:

$1 mi ^ 2 = 640 acres$

The population density is given by:

$D = \frac{x}{y}$

Where,

x: total number of people

y: total area

Substituting values we have:

$D =\frac{750000}{49 * 640}$

$D = 23.9 \frac{people}{acre}$

Rounding the nearest whole we have:

$D = 24 \frac{people}{acre}$

Answer:

The population density in San Francisco is:

$D = 24 \frac{people}{acre}$