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The adult human scalp has about 125 square inches of space for hair growth. Also, the adult human grows about 100,000 strands of hair on their head.

What is the unit rate of hair on an adult humans head?

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Explanation:

100 000 hairs / 125 in^2 = 800 hairs/in^2 ==== 800 hairs per square inch

User Michael Gisbers
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