AB + BC + CD = 68
AB = 16
BC = AB + x = 16 + x
CD = 68 - AB - BC = 68 - 16 - 16 - x = 36 - x = 36 - 24 = 12
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AB + BC + CD = 68
AB = 16
BC = AB + x = 16 + x
CD = 68 - AB - BC = 68 - 16 - 16 - x = 36 - x = 36 - 24 = 12