Question
The length of a string is 17 m longer than a wire. The length of a thread is 13 m shorter than the string. The total length of the string, the thread and the wire is 87 m. What is the length of the string?
4 m

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The length of a string is 17 m longer than a wire. The length of a thread is 13 m shorter than the string. The total length of the string, the thread and the wire is 87 m. What is the length of the string?