How many definitions of units of measurement did France have prior to the Revolution?

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This was the case before the French Revolution in the late 18th Century, where weights and measures varied not only from nation to nation, but also within nations. In France alone, it was estimated at that time that at least 250,000 different units of weights and measures were in use during the Ancien Régime.

Explanation:

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your answer would be fusion

(75°f − 32) × 5/9 = 23.889°c