The volume of the water initially in the tank is= 32*20*10 = 6400 cm^3. The total volume / (capacity) of the tank is C = 32*20*30 = 19200 cm^3. The volume of the stone is = 25*18*15 = 6750 cm^3. The sum + = 6400 + 6750 = 13150 cm^3. The conclusion: there is NO overflowing. ANSWER