What's The Answer To The 100 Houses Math Puzzle?

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Here's a brain teaser that may sound easy or obvious, but is really more complex below the surface. This is the 100 houses math puzzle: There are five who can build five houses in just five days. Increase the amount of people to 100. How long would it take these 100 people to build 100 houses? Is the answer just as simple as saying 100?