問題詳情
27. 圖 ( 十四 ) 的等臂天平呈平衡狀態，其中左側秤盤有一袋石頭，右側秤盤有一袋石頭和 2 個各 10 克的砝碼。將左側袋中一顆石頭移至右側秤盤，並拿走右側秤盤的 1 個砝碼後，天平仍呈平衡狀態，如圖 ( 十五 ) 所示。求被移動石頭的重量為多少克？
(A) 5
(B) 10
(C) 15
(D) 20
參考答案
無參考答案
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