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题库 / Prep2007E2-PS-138
A grocer stacked oranges in a pile. The bottom layer was rectangular with 3 rows of 5 oranges each. In the second layer from the bottom, each orange rested on 4 oranges from the bottom layer, and in the third layer, each orange rested on 4 oranges from the second layer. Which of the following is the maximum number of oranges that could have been in the third layer?
5
4
3
2
1
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原来是放在四个橘子中间的意思...
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从最底层开始 A*B个，那么上面一层就是（A-1）*（B-1）个。
最下面一成是长方形状的，3行，每行5个橘子
倒数第二行：每个橘子都要放在4个橘子上面（只能放8个）
倒数第三行：每个橘子还是要放在4个橘子上面（4个倒数第二行的橘子）
那就只能放3个