Problem 6 · 2019 Math Kangaroo
Easy
Spatial & Visual Reasoning
spatial-reasoningwork-backward
Five equally big square pieces of card are placed on a table on top of each other, making the picture shown. The cards are collected up from top to bottom. In which order are they collected?
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Answer: E — 5-2-3-1-4
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Hint 1 of 2
The card on top is the one whose whole shape is fully visible, none of it hidden.
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Hint 2 of 2
Pick up the fully-showing card first, then the next one that becomes fully visible, and so on.
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Approach: peel cards top-down, taking the fully-visible one each time
- The card that is completely visible (nothing covering it) is on top, so it comes off first.
- Remove it, then find the next card that is now fully uncovered, and take that one.
- Repeating this gives the order of collection from top to bottom.
- That order matches option E.
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