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The numbered net is folded into a cube. What is the sum of the numbers on the four faces next to the face numbered 4?

Competition practiceDice & Cubes
  • A17
  • B21
  • C16
  • D15

Step-by-Step Solution

With 6 as the base, 2 and 5 fold up as two opposite walls, 1 (joined to 2) and 4 (joined to 5) become the other two walls on opposite sides, and 3 closes the top. So 4 is opposite 1 and its neighbours are 3, 2, 6 and 5: . (21 is the total of all six faces.)
Answer: C) 16

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