Question
The total length of a string, a ribbon and a thread is 39.8 m. The thread is 9 m longer than the string. The ribbon is 5 times as long as the string. Find the difference in length between the ribbon and the thread.
4 m

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The total length of a string, a ribbon and a thread is 39.8 m. The thread is 9 m longer than the string. The ribbon is 5 times as long as the string. Find the difference in length between the ribbon and the thread.