The hairs of a man were found with the follicle in tact. The hair

was 19 mm from follicle to tip. If

hair grows approximately 0.44

mm per day, how old is the tip of

the hair?

It can be assumed that the hair is 43 days old

Explanation:

Since the follicle of the hair is still intact, then we can assume that is the entire stretch of the hair.

If the air grows 0.44 mm per day, then we can say

0.44 ⇒ 1 day

19 ⇒ ?

? = 19 × 1/0.44

? = 43.18 ⇔ 43 days

It can be assumed that the hair is 43 days old

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