Question
The total length of 4 ropes and 9 threads is 261 cm. The length of a thread is 15 of the length of the rope. What is the total length of the 9 threads?
4 m

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The total length of 4 ropes and 9 threads is 261 cm. The length of a thread is 15 of the length of the rope. What is the total length of the 9 threads?