Question
The average length of 13 pieces of ribbon was 212 cm. When 4 pieces of ribbons were used, the average length of the remaining pieces of ribbons became 128 cm. What was the average length of the 4 pieces of ribbons used?
4 m

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The average length of 13 pieces of ribbon was 212 cm. When 4 pieces of ribbons were used, the average length of the remaining pieces of ribbons became 128 cm. What was the average length of the 4 pieces of ribbons used?