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Answer :

Answer:

The volume of the rubber stopper is 8.3 mL.

Explanation:

because the initial volume of the water was 12.5 mL and the new volume was 20.8 mL. So you subtract the 20.8 minus 12.5 and you get 8.3 mL.

Answer:

its "The volume of the rubber stopper is 8.3 mL."