Question
A plank 9 m long is cut into 3 pieces. The 2nd piece is 16 m long. The 3rd piece is 12 m longer than the 2nd piece. What is the length of the 1st piece?
3 m

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A plank 9 m long is cut into 3 pieces. The 2nd piece is 16 m long. The 3rd piece is 12 m longer than the 2nd piece. What is the length of the 1st piece?