A child weighing 12 kg is sitting on a swing at a distance of 130 cm from the axis of rotation. How far away from the axis of rotation (center) must sit down his mother weighs 57 kg if she wants to be swing in balance?


x =  27.368 cm


12*130 = 57 x

57x = 1560

x = 52019 ≈ 27.368421

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