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Some Grid Fill puzzles have multiple solutions. Can you use one solution to find others without starting over from scratch?

Pulling the napkin out from under all five of these sugar shakers would be a sweet trick. But is it even possible?

These rectangles are overlapping like a Venn diagram, so why not use Venn diagram strategies to find the shaded area?

Sometimes area problems require careful calculation with formulas. Sometimes, though, there's another approachâ€¦

The confusion of the inverse is the conflation of two related conditional probabilities. Today, you'll see how it applies to medical testing.

There are more than a dozen gears in this gear train. Can you spot an easy way to compare the output gears?

In this puzzle, three conditions tell you where the pieces can go. Use the clues to narrow down the possible arrangements.

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