What is the surface-area-to-volume ratio of a cube with sides of 5 cm?
Answer and explanation
Correct answer: D. 6/5 per cm
- Step 1: Surface area = 6 × 5² = 150 cm²; volume = 5³ = 125 cm³. Step 2. Ratio = 150 ÷ 125 = 6/5 per cm. Answer: 6/5 per cm. Why not the others: 5/6 per cm is what you get if you invert the ratio. 150 per cm is what you get if you give the surface area. 1/5 per cm is what you get if you forget the six faces.
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