Question
Lucy cut 510 cm of a ribbon into 3 pieces. The 1st piece was 2 times as long as the 2nd piece. The 3rd piece was 81 cm long. How long was the 2nd piece?
4 m

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Lucy cut 510 cm of a ribbon into 3 pieces. The 1st piece was 2 times as long as the 2nd piece. The 3rd piece was 81 cm long. How long was the 2nd piece?