Question
The total length of a streamer, a thread and a ribbon is 79.9 m. The ribbon is 12 m longer than the streamer. The thread is 5 times as long as the streamer. Find the difference in length between the thread and the ribbon.
4 m

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The total length of a streamer, a thread and a ribbon is 79.9 m. The ribbon is 12 m longer than the streamer. The thread is 5 times as long as the streamer. Find the difference in length between the thread and the ribbon.