3) AB + BC + CD = 20
AB = AC - BC
CD = BD - BC
AD = AC - BC + BC + BD - BC = AC + BD - BC = 12 + 11 - BC = 20
BC = 3
4) AC = AB + BC
17 = AB + 2
AB = 15
BD = CD + BC
8 = CD + 2
CD = 6
AD = AB + BC +CD = 15 + 2 + 6 = 23
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3) AB + BC + CD = 20
AB = AC - BC
CD = BD - BC
AD = AC - BC + BC + BD - BC = AC + BD - BC = 12 + 11 - BC = 20
BC = 3
4) AC = AB + BC
17 = AB + 2
AB = 15
BD = CD + BC
8 = CD + 2
CD = 6
AD = AB + BC +CD = 15 + 2 + 6 = 23