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Fold a square sheet along the diagonal from top-right to bottom-left, and then fold the triangle in half along its line of symmetry. Three holes are punched. How many holes will the sheet show when opened?

Competition practicePaper Folding & Punching
  • A12
  • B6
  • C8
  • D16

Step-by-Step Solution

Each fold doubles the layers, so the small triangle is 4 layers thick. Each of the 3 punches makes 4 holes: .
Answer: A) 12

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