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當槓桿達到平衡時，施力臂和抗力臂都是3格，施力點和抗力點各掛了2個砝碼 。
Explanation:
For a balanced lever,
we have the following relationship:
EX:
A balanced lever has two weights on it, the first with mass 6Kg and the second with mass 4 kg. If the second weight is 18 M from the fulcrum, how far is the first weight from the fulcrum?
6Kg X ☐M = 4Kg X 18M
6 X ☐ =72
☐ = 12 M
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