The population of Bangladesh is about $\displaystyle{1.5}\times{{10}}^{{8}}\usepackage{cmbright}\Huge\$ people. The area of Bangladesh is about $\displaystyle{5}\times{{10}}^{{4}}\usepackage{cmbright}\Huge\$ square miles. If population density is found by dividing the population of a country by its area, what is the approximate population density of Bangladesh per square mile? Find the quotient, express it in scientific notation, and then fill in the missing number.

$\displaystyle\frac{{{1.5}\times{{10}}^{{8}}}}{{{5}\times{{10}}^{{4}}}}={3}\times{{10}}^{?}\usepackage{cmbright}\Huge\$