Adrop of gasoline has a mass of 22 mg and a density of 0.754 g/cm^3. what is its volume in cubic centimeters?

The density can be calculated using the following rule:
density = mass/volume
therefore,
volume = mass/density

we have the mass=22 mg=0.022 grams and density=0.754g/cm^3

substituting in the above equation, we can calculate the volume as follows:
volume = 0.022/0.754 = 0.0291 cm^3