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A cube of side 6 cm is cut into identical small cubes of side 2 cm. Find the ratio of the combined surface area of all the small cubes to the surface area of the original cube.

Competition practiceAreas & Volumes
  • A3:1
  • B27:1
  • C9:1
  • D1:3

Step-by-Step Solution

Number of small cubes = . Each has surface area , so the total is . The original cube has . Ratio = 648 : 216 = 3 : 1.
Answer: A) 3:1

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