Another buoyancy problem. help

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another buoyancy problem. help!

Homework Statement


The density of water is 1000 kg/m3. A block of wood of uniform density floats so that exactly 3/4 of its volume is underwater. What is the density of the block?


Homework Equations


b=mg
p=m/v


The Attempt at a Solution



not sure how to account for the 3/4 under water part.
 
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Buoyancy is defined as the weight of the water that the object displaces.

How much water is displaced?