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2020 Math Kangaroo

Problem 9

Problem 9 · 2020 Math Kangaroo Medium
Spatial & Visual Reasoning cube-viewsshadows-projections
Figure for Math Kangaroo 2020 Problem 9
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Answer: B
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Hint 1 of 2
Looking straight down, each tower of cubes shows up as one colored square in the grid.
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Hint 2 of 2
Match the footprint and the light/dark pattern to one option.
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Approach: project the construction onto a top-view grid
  1. From above you see one square per stack, colored by the top cube (light or dark).
  2. The footprint shape and the light/dark squares match option B.
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