Quantity does not seem to be subject to any material body, rather, the material body must is assumed by the quantity itself, if there is an instantiation of the thing or things themselves. E.g. 3 balls, 3 sticks, 3 stars, etc. Quantity, being inherently true to rational men, seems to simply affirm how many there was, is, or could be, with anything that may be known.
EAR