3 out of 3
Knights always tell the truth. Knaves always lie. Can you catch these knights and knaves out?
2 out of 3
What is the area of the triangle formed by these three lines?
2 out of 3
Weekly Problem 41 - 2014
Three straight lines divide an equilateral triangle into seven regions. What is the side length of the original triangle?
2 out of 3
Three faces of a $3 \times 3$ cube are painted red, and the other three are painted blue. How many of the 27 smaller cubes have at least one red and at least one blue face?
2 out of 3
If the area of a face of a cuboid is one quarter of the area of each of the other two visible faces, what is the area of these faces?
3 out of 3
Weekly Problem 51 - 2015
Charlie is making clown hats from a piece of cardboard. What is the maximum number he can make?
2 out of 3
What is the perimeter of this unusually shaped polygon...
1 out of 3
Weekly Problem 44 - 2006
How long does it take an athelete to walk, cycle and run three miles if this is 10 minutes slower than cycling the whole distance?
1 out of 3
Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?
