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The question is not clear but I think this is likely what you are looking for.

If $2/3$ of the block of wood is submerged then
$color(white)("XXX")$the mass of water displaced by $2/3$ of the volume of the block of wood is equal to the mass of the block of wood.

Another way to say this is:
each unit volume of wood can be supported by $2/3$ of a unit volume of water.

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