Total volume = Edge³. Remaining fraction = 1 − \(\frac{5}{21}\) = \(\frac{16}{21}\).

• Total volume = 21 × 21 × 21 = 9261 cm³
• Remaining = \(\frac{16}{21}\) × 9261
• 9261 ÷ 21 = 441; 16 × 441 = 7056 cm³
• 7056 ÷ 1000 = 7 remainder 56
• 7 l 56 ml

Final Answer: 7 l 56 ml