A teeter-totter is made of a 5400 m long plank with a mass, Ask an Expert

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A teeter-totter is made of a 5.400 m long plank with a mass of 58.0 kg, with a fulcrum (pivot point) located 2.900 m from the right end. If a box with a mass of 94.0 kg is placed at the extreme right end of the plank, what mass must be placed at the left end so that the teeter-totter is balanced?

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