Question
The length of a wire is 21 m longer than a rope. The length of a thread is 12 m shorter than the wire. The total length of the wire, the thread and the rope is 99 m. What is the length of the wire?
4 m

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The length of a wire is 21 m longer than a rope. The length of a thread is 12 m shorter than the wire. The total length of the wire, the thread and the rope is 99 m. What is the length of the wire?