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A.
The post office states the range of the number of mailing per day in november is 19 and the range of the number of mailing per day in december is 21, what is the smallest possible range of the number of mailings per day in November and Decemer combined?

A. 19
B. 20
C. 21
D. 25
E. 40­

Why can't we assume that smallest possible mailing Nov is 2?
Why do we have to assume 0 for both

We can say 19 can be the range smallest possible

You don't have to assume any specific number. The range for November is given as 19, and the range for December is 21. The smallest possible range for these two months combined must be at least 21. This is because the range is determined by the difference between the maximum and minimum values, so if the difference between two days in December is already 21, adding more days from November cannot reduce this difference.

Answer: C

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Hope it helps.
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