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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
23
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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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