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A company produces boxes of DVD's at a rate of 52 boxes per hour. They begin to produce boxes when they first open for the day and after three hours have 404 boxes in stock. How many boxes were in stock when they opened?

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Answer: 248 boxes

Step-by-step explanation:

They produce boxes at a rate of 52 boxes an hour yet after only 3 hours they had 404 boxes.

The number they were supposed to have in 3 hours is:

= 52 * 3

= 156 boxes

They instead had 404 so the rest must have been there when they opened:

= 404 - 156

= 248 boxes

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