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A 2.80 kg steel gas can holds 20 L of gasoline when full. What's the average density (in kg/m^3) of full gas can, taking into the volume occupied by steel as well as by gasoline?

Work:

Given

the mass of the steel gas can= 2.80 kg

The Total Volume of Gas can= 20.0 L

The density of the gasoline= 680 kg/m^3

$\rho=\frac{m}{Volume of the gasoline}$

How to setup the problem?

Thanks

Cbarker1