حجم استخر = x          $\frac{2}{3}$ = $\frac{4}{6}$     $\frac{1}{2}$ = $\frac{3}{6}$        $\frac{4}{6}$ x  - 8000 =  $\frac{3}{6}$ x $\frac{1}{6}$ x = 8000 x = 8000 × 6 = 48000