Seesaw dog

A boy (mass 30 kg 30 \text{ kg} ) wishes to play on a centrally pivoted seesaw with his dog Irving (mass 10 kg 10 \text{ kg} ). When the dog sits 3.0 m 3.0 \text{ m} from the pivot, where must the boy sit if the 6.5 m 6.5 \text{ m} long board is to be balanced horizontally?

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