Question

A fossil is found to have `1/32` of its carbon- 14 remaining. How old is the fossil?

Answer 1

`5` half lifes (half lives?)

Explanation:

`1/32 = 1/2^5`, so the fossil has aged for 5 half lifes.

Assuming the half life is `5,730` years, that's `5 xx 7,730 = 28,650` years old.