A 1600 pound polar bear is floating in seawater, which has a density of 64 lbs/ft[sup]3[/sup].  1/2 cubic foot of bear is above water.  Find the volume of the bear. 

Now, what I did was take  mass = density X  volume    and I got v = 25 cubic feet.    My teacher says this is wrong because 1/2 cubic foot is above water.  I dont understand what difference that makes.  If I put an 8 cubic foot block into water or hold it above in the air, the volume doesnt change.  It's still going to be 8 cubic feet.  right?