You cannot add things with units to things without units. "300mL" has a unit. "2/3" does not. Please resubmit your question where both items either have units or do not.
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2/3
One third plus one third equals two thirds.
1/2 .
if you add one third and one third you get two sixths then if you divide it by 2 each you will get it back to one thirds
2/3