Question
The average length of 6 pieces of streamer was 210 cm. When 2 pieces of streamers were used, the average length of the remaining pieces of streamers became 170 cm. What was the average length of the 2 pieces of streamers used?
4 m

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The average length of 6 pieces of streamer was 210 cm. When 2 pieces of streamers were used, the average length of the remaining pieces of streamers became 170 cm. What was the average length of the 2 pieces of streamers used?