AB/AC = 4/5 so AB = 4 AC/5
AB + AC + 9 = 29
AB + AC = 20
4 AC/5 + AC = 20
4 AC + 5 AC = 100
9 AC = 100
You forgot to change 29m to 2900cm.
*The problem should say 29 cm.
AB/AC=4/5, so 4AC=5AB, which is also 4/5(AC)=AB.
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