Infinitely many. You can represent any distance in real life by 1 unit on your scale or, conversely, you use any distance on your scale drawing to represent a unit of length in real life.
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They are verbal scale, Linear Scale and fraction scale.
Both of them are diatonic scales. Major scale is written as per key signature. Harmonic minor scales have a raised 7th. The semitone leaps in these scales are different.
The Architect scale have 6 scales, it is a three sided scale with two scales per side. This is also true of the Engineers scale.
A set of scales.
The answer depends on what aspect of the scale drawing you wish to calculate.