Question
The total length of a thread, a ribbon and a streamer is 51.5 m. The streamer is 12 m longer than the thread. The ribbon is 3 times as long as the thread. Find the difference in length between the ribbon and the streamer.
4 m

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The total length of a thread, a ribbon and a streamer is 51.5 m. The streamer is 12 m longer than the thread. The ribbon is 3 times as long as the thread. Find the difference in length between the ribbon and the streamer.