Problem 7 · 2023 Math Kangaroo
Medium
Spatial & Visual Reasoning
net-foldingfoldingreflection
Susi folds a piece of paper in the middle. She stamps 2 holes. What does the piece of paper look like when she unfolds it again?
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Answer: B
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Hint 1 of 3
The punch goes through both layers, so each hole really makes two holes.
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Hint 2 of 3
When you open the paper, every hole gets a twin on the other side of the fold.
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Hint 3 of 3
Each twin sits the same distance from the fold line, like a mirror.
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Approach: each punched hole appears twice, mirrored across the fold
- Because the paper is folded, the punch cuts through both halves at once.
- So when Susi opens it, each of the 2 holes has a matching twin mirrored across the fold line.
- That gives 4 holes in mirror-image positions, which is the picture in option B.
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