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The commutative or Abelian property.
It is not possible to find out the average of a number without knowing how many numbers were added together to get said number. If there were say, 7 numbers added together to get the total of 27.352, then you would divide 27.352 by 7 to get the average.
Commutative property
Addition and multiplication are commutative. That's the property you're looking for.