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The Problem of Cake Cutting in Junior One Mathematics
In addition to the above answer, there is another one, which is an open math problem:

The other is:

One knife is two dollars, two knives are four dollars, three knives are six dollars, four knives are eight dollars ... If you cut N knives, there will be 2N dollars.

Only one knife always cuts at the midpoint of the width, and the rest of the knife method is to divide the length into equal parts.