Given, volume of wod vo = 100
density of wood do = 0.6
density of water dl = 1
mass of block m o = do * v o
or , mo = 0.6 * 100
or mo = 60 g
When block is floating and vl be the volume of water displaced then,
vo do g =vl dl g
vl = (100 * 0.6 ) / 1
vl = 60cm-3
Now mass of water displaced ml = vl * dl
or ml = 60 * 1
or ml = 60 g.
Hence vl is same as that of the volume of immersed block in water, so the volume immersed in water = 60 cm3