Posted by **Randi** on Friday, January 29, 2010 at 2:48pm.

Hey guys - this problem is pretty tough for me...any help? Don't know what to do....

In seawater, a life preserver with a volume of 4.00×10^−2 m^3 will support a 76.0 kg person (average density 980 kg/m^3), with 20.0 % of the person's volume above water when the life preserver is fully submerged. What is the density of the material composing the life preserver? (answer in kg/m^3)

Thanks!

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