Can you answer this question and tell me how you arrived at the answer?

Question

How many centimeters out of the water does a 1.00 cm cube of wood with a density of 0.85g/ml float?

Answer 1

floatation means that the weight of the water displaced equals the weight of the box.
assume that water weighs 1g/ml.
by definition 1ml = 1 cm^3
call the depth that the wood displaces 'd'

the weight of the water is 1cm x 1cm x dcm x 1 g/ml
the weight of the wood is 1cm x 1cm x 1cm x .85g/ml
set them equal
1x1x1xd = 1x1x1x.85
obviously d = .85
so the height out of the water is 1-.85 = .15cm