Question
On 3 September to 6 September, an average of 56 wafers were sold and from 7th September to 11 September, an average of 20 wafers were sold. $348 worth of wafers were sold from 12 September to 22 September. Given that a wafer was sold for $3, find the average number of wafers sold from 3 September to 22 September.
4 m

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On 3 September to 6 September, an average of 56 wafers were sold and from 7th September to 11 September, an average of 20 wafers were sold. $348 worth of wafers were sold from 12 September to 22 September. Given that a wafer was sold for $3, find the average number of wafers sold from 3 September to 22 September.