Find the original volume, then subtract the amount left.

• Original volume = 25 × 25 × 20 = 12500 cm³
• Left = 6.05 l = 6050 cm³
• Poured out = 12500 − 6050 = 6450 cm³
• 6450 ÷ 1000 = 6 remainder 450
• 6 l 450 ml

Final Answer: 6 l 450 ml