Answer:
Density = 3 g/cm³
Step-by-step explanation:
Density is a ratio which compares an object's mass per every 1 unit volume. Grams is a unit of mass and cm³ is a unit of volume. Since you have been given values for both a mass and volume, you can use them to determine the density.
Density = g/cm³ <----- Density units
Density = 90 g / 30 cm³ <----- Insert values
Density = 3 g / 1 cm³ <----- Simplify
Density = 3 g/cm³