A certain aquatic plant in the pond grows extremely fast. The number of aquatic plants on the current day is twice that of the previous day. It is also known that the pond is full in 10 days. How many days does it grow (1/4) of the pond?
池塘里某种水草生长极快，当天的水草数量是它前一天的2倍，又知10天长满池塘，多少天长了池塘的(1/4)？
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