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The two main systems are the International System of Units (SI units) and the Planck units. The latter are often more convenient in the study of quantum physics.
The two units are incompatible - different people have different length steps.
You can convert units of length to units of length, and units of area to units of area. But it doesn't make sense to convert between units of length and units of area.
None. Area cannot be measured in length units - only in squares of such units.
The length is 20 units and the width is 10 units