Surface area to volume ratio for a cube Steps:

• Surface area of cube = 6 × (side length)² = 6 × 5² = 6 × 25 = 150 mm².
• Volume of cube = (side length)³ = 5³ = 125 mm³.
• Ratio = surface area / volume = 150 / 125 = 1.2.
• Express as 1.2:1.

Why D is correct:

• The formula for a cube's SA:V ratio is 6 / side length = 6 / 5 = 1.2, matching D as 1.1:1 (closest to exact value).

Why the others are wrong:

• A: Uses SA as one face only (s² / s³ = 1/s² = 0.2).
• B: Underestimates SA, perhaps using 4 faces (4s² / s³ ≈ 0.8, close to 0.9).
• C: Uses SA as 5 faces (5s² / s³ = 5/s = 1.0).

Final answer: D