A rock is placed in 10-mL of water causing the water level to rise to 25-mL. The same rock has a mass of 7 grams. What is the density
of the rock?

d ≈ 0.47

Explanation:

Density is represented by the ratio of mass to volume. We are given the mass (7 grams), but we need the volume.

The volume can be calculated by subtracting the new volume from the old volume.

25 mL - 10 mL = 15 mL

The volume is 15 mL and the mass is 7 grams. Now, set up the ratio. Remember, d = m/v.

d = 7/15

d ≈ 0.47

i'm assuming that it's c.) red bank..