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The angles in these triangles are related to one another. Can you find the measure of the yellow angle?

El the Elephant wants to lift his five friends. Will this pulley suffice?

Counting elements of the union of two sets is a bit more complicated than simply adding the elements of both. How many integers aren't divisible by 3 or 11?

Smaller and smaller squares fill in the area around this square’s diagonal. What fraction of the large square’s area is shaded?

Some of these Londoners are humans, and some are werewolves. Look for contradicting statements to find who's telling the truth and who isn't.

You can get zero by changing some of the plus signs. Which operation must come first?

Jeremiah wants to use every mode of transportation while sight-seeing. Where should he begin?

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