. A see-saw of length 4 m, pivoting at its centre, rests in a horizontal position....

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. A see-saw of length 4 m, pivoting at its centre, rests in a horizontal position. Mary, who weighs 30 kg, is going to sit on one end. Where should her friend Ted, who weighs 40 kg, sit if the see-saw is to balance? . A see-saw of length 4 m, pivoting at its centre, rests in a horizontal position. Mary, who weighs 30 kg, is going to sit on one end. Where should her friend Ted, who weighs 40 kg, sit if the see-saw is to balance?