Question
The average length of 11 pieces of string was 229 cm. When 4 pieces of strings were used, the average length of the remaining pieces of strings became 157 cm. What was the average length of the 4 pieces of strings used?
4 m

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The average length of 11 pieces of string was 229 cm. When 4 pieces of strings were used, the average length of the remaining pieces of strings became 157 cm. What was the average length of the 4 pieces of strings used?