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By combining arithmetic and logic, we can deduce what digit corresponds to each letter. What is EH+AH?

Jerome is using two differently sized containers to measure 10 liters of water. What's the smallest number of moves he needs to make?

This figure is made from a triangle, a semicircle, and a quarter-circle. Can you find the shaded area?

Although we can't predict the outcome of a random game, we can find the most likely result. How much do you expect to win?

With few guests, the hotel can avoid putting guests in adjacent rooms. How many guests until they must have three occupied rooms in a row?

Solving a Grid Fill puzzle involves logic and arithmetic. How can you make both rows sum to 6?

We can infer a lot about the relationship between two angles in this circle with just a few angle facts. Which angle is larger?

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