The number of water lilies at the lake is doubling each day. If they covered the whole lake in 24 days, how many days were needed that they cover half of the lake? Someone stated that the answer is obvious and it is 12 days. Is he correct? If yes, explain how he calculáted that? If no, where did he made a mistake?

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.