Set up with lasers in a cross
Recently, Fred got three more feeding bowls. How many laser detectors will they have to get so they can keep all seven bowls separated by laser beams?
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Brainteaser answer
Fred can make seven sections with three laser detectors, so they’ll only need to get one more.
They can space three laser detectors around the paddock, aiming them so the beams meet in the middle, to get six sections (like six slices of pizza).