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  3. At Kew Gardens, the giant Victoria lily grows in a small pond.Suppose it doubles

At Kew Gardens, the giant Victoria lily grows in a small pond.Suppose it doubles

游客2023-10-12  28
问题 At Kew Gardens, the giant Victoria lily grows in a small pond.Suppose it doubles its size each day and it covers the whole pond—as it does—after 30 days.After how many days does it cover half the pond?
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答案 After 29 days.
解析 题干意思是指睡莲每天增一倍，30天后覆盖整个湖面，问题是“多少天后覆盖半个湖面”，由于一天增一倍，所以是前一天，即29天后，覆盖的是半个湖面。
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