Question
The average length of 11 pieces of streamer was 246 cm. When 3 pieces of streamers were used, the average length of the remaining pieces of streamers became 117 cm. What was the average length of the 3 pieces of streamers used?
4 m

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The average length of 11 pieces of streamer was 246 cm. When 3 pieces of streamers were used, the average length of the remaining pieces of streamers became 117 cm. What was the average length of the 3 pieces of streamers used?