Question
The average number of wafers in Box L, Box M and Box N is 38. Box L has 49 wafers. The number of wafers in Box M is four times the number of wafers in Box N. What is the number of wafers in Box N?
2 m

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The average number of wafers in Box L, Box M and Box N is 38. Box L has 49 wafers. The number of wafers in Box M is four times the number of wafers in Box N. What is the number of wafers in Box N?