If a rope is wound around the post for two turns, the rope will be 40 cm more. If it is wound around the post for three turns, the rope will be 20 cm less. How long is the rope?
(40 + 20) △ 3-2, = 60 △ 1, = 60 (CM), 60 × 2 + 40, = 120 + 40, = 160 (CM). A: This rope is 160 cm long
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