We have to calculate the density of topsoil, 40 lb of which have a volume of 1.9 gal.

**Density** of a substance is defined as the mass contained in unit volume.

$\overline{){\mathbf{density}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}}{\mathbf{volume}}}$

A 40-lb container of topsoil has a volume of 1.9 gal.

Calculate the average density of topsoil in units of g/cm^{3}.

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