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A square sheet is folded along the diagonal into a triangle, and then the left corner of the triangle is folded across along an upright crease (shown darker). Two holes are punched. How many holes appear on opening?

Competition practicePaper Folding & Punching
  • A8
  • B4
  • C6
  • D5

Step-by-Step Solution

After the diagonal fold the paper is 2 layers. Where the flap lies there are 4 layers, so the hole there makes 4 holes; the other hole is in the 2-layer part and makes 2. Total .
Answer: C) 6

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