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6 m long see-saw remains horizontal when...

6 m long see-saw remains horizontal when two children weighing 20 kg and 30 kg respectively sit at two ends. Where is the see-saw supported?

A

3.6 m from 20 kg

B

2.6 m from 30 kg

C

4 m from 20 kg

D

4.2 m from 30 kg

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