3 answers
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Milly sells 8 boxes every 3 days. This means she sells 8/3 boxes per day.
To determine how many days it will take her to sell 56 boxes, divide the number of boxes (56) by the number of boxes she sells per day (8/3).
56 / (8/3) = 56 * (3/8) = 21
Therefore, it will take her 21 days to sell 56 boxes.
The answer is D. 21 days.