Four identical weights are each 5 kilograms. What is the range of these four weights?

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The largest and smallest weights are both 5 kilograms, so the range is 5 - 5 = 0 kilograms. Answering 5 kilograms repeats the value every weight shares, yet a range of 0 is exactly the message here, because identical values leave no distance at all between the extremes.