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Problem 389

AMC 12 late, AIME early

Geometry Difficulty 4.7 Find the answer

1. A bridge was built using some identical wooden planks, each plank is 30 cm long, and the length of each connection part is 10 cm, so the length of the bridge is $\qquad$ cm.

Your answer

Official solution

$230$

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.