[tex]V_{g} =P_{pg} \cdot h~~\land ~~h=27~cm\\\\V_{o} =\dfrac{1}{3} \cdot P_{po} \cdot H~~\land ~~H=?\\\\Wiemy:\\\\V_{g}=V_{o}~~oraz ~~P_{pg} =P_{po} ~~\Rightarrow ~~\dfrac{1}{3} \cdot H =h~~\land ~~h=27~cm\\\\\dfrac{1}{3} \cdot H = 27~cm~~\mid \cdot 3\\\\H=81~cm\\\\Odp:~~D.~~81~cm[/tex]
