Question
The average length of 13 pieces of string was 163 cm. When 3 pieces of strings were used, the average length of the remaining pieces of strings became 112 cm. What was the average length of the 3 pieces of strings used?
4 m

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The average length of 13 pieces of string was 163 cm. When 3 pieces of strings were used, the average length of the remaining pieces of strings became 112 cm. What was the average length of the 3 pieces of strings used?