# Billy had a stone with a mass of 206 and volume of 65. What is the density?

$\text{Density, } \rho$ $=$ $\text{Mass"/"Volume}$ $=$ ${10}^{-} 1 \text{ hundredweight per gill}$?
The usual units are $g \cdot c {m}^{-} 3$ or $g \cdot m {L}^{-} 1$.