2. 水深 = 20³÷[(22 - 1 x 2) x (12 - 1 x2]公分 = 8000÷(20 x 10)公分 = 8000÷200公分 =40公分
3. 倒入水後水深 = (24 x 1000)÷40²公分 = 24000÷1600公分 =15公分
加入鐵塊後水面上升 = (10²x 16)÷40²公分 = 1600÷1600公分 =1公分
參考資料 賣女孩的火柴
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