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IKMC 2017 - Grades 5-6 - Self-study Question 25

IKMC · IKMC 2017 - Grades 5-6 - Self-study

Question 25

The square floor is covered by grey or white triangular and square tiles. What is the smallest number of grey tiles that need to be swapped with white tiles so that the pattern looks the same from all four directions shown?

Question illustration
  1. Three triangles, one square
  2. One triangle, three squares
  3. One triangle, one square
  4. Three triangles, three squares
  5. Three triangles, two squares