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The inequality between arithmetic and geometric means allows us to find bounds for sums and products. What can't the four ages sum up to?

Different bulb combinations produce different amounts of light. Which circuit will shine brighter?

In this jigsaw map puzzle, the clues determine the locations of three of the pieces. Where can we place the fourth piece?

To calculate the probability of an event, we count the number of ways the event could occur. Who is more likely to win?

This cryptogram is the cat's MEOW; will it make you say WOW?

One arrangement of the instructions makes X contain the square of the sum of A and B. What about the other arrangement?

This teacher wrote a test question with more solutions than she wanted. How many fewer solutions are there when she changes a constraint?

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