While chatting in the school cafeteria, Cesar's friend Demi tells him that a new fantasy series was on Netflix and he should watch it. The new series has 12 seasons, and each season has 20 episodes. If Cesar watched 1/3 of the series before the school closed, how many episodes were remaining for him to finish the series?
Please reason step by step, and put your final answer within \boxed{}.
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