The areas of three squares are 16, 49 and 169.  What is the average (mean) of their side lengths?
Question:
The areas of three squares are 16, 49 and 169.  What is the average (mean) of their side lengths?
Answer:
Let's think step by step.

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The areas of three squares are 16, 49 and 169.  What is the average (mean) of their side lengths?
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