# A bead weighs 15 g, you place it in a graduated cylinder that has 20mL of water in it. After placing the bead in the cylinder, the water level is now at 30mL. What is its density?

I found: $\rho = 1.5 \frac{g}{c {m}^{3}}$
Density $\rho$ is equal to $\text{mass"/"volume}$
so in our case the mass is $15 g$ while the volume should be: $30 - 20 = 10 m l = 10 c {m}^{3}$
$\rho = \frac{15}{10} = 1.5 \frac{g}{c {m}^{3}}$