Ask your students to find the solution to this problem:

You have 50 boxes to deliver to a series of stops. At the first stop you are to leave 1 box. At the second stop you are to leave 2 more boxes than the first. At the third stop you are to leave 2 more than at the last stop, and so on. At what stop will you not have enough boxes to make a delivery?

Answer: eighth stop

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