题目信息
As shown in the diagram above, a lever resting on a fulcrum has weights of $$w_{1}$$ pounds and $$w_{2}$$ pounds, located $$d_{1}$$ feet and $$d_{2}$$ feet from the fulcrum. The lever is balanced and $$w_{1}$$ $$d_{1}$$ = $$w_{2}$$ $$d_{2}$$• Suppose $$w_{1}$$ is 50 pounds and $$w_{2}$$ is 30 pounds. If $$d_{1}$$ is 4 feet less than $$d_{2}$$, what is $$d_{2}$$, in feet?
A:1.5
B:2.5
C:6
D:10
E:20
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正确答案：
D:10
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