Okay, here's the deal:

I have a substance that reduced in number from 50, to 28, to 17, to 5, and then to 2. In percentages, it went from being 100% present, to 56%, then 34%, 16%, 10%, and finally 4%. What is the half-life?

Could you write out your work, I want to understand how to solve this, not just get an answer. Thanks so much!!
Update : **The substance was pieces of candy- I'm supposed to pretend it was a chemical or something going through radioactive decay.

Question

Okay, here's the deal: 

I have a substance that reduced in number from 50, to 28, to 17, to 5, and then to 2. In percentages, it went from being 100% present, to 56%, then 34%, 16%, 10%, and finally 4%. What is the half-life? 

Could you write out your work, I want to understand how to solve this, not just get an answer. Thanks so much!!
Update : **The substance was pieces of candy- I'm supposed to pretend it was a chemical or something going through radioactive decay.

miracrown · Answer

Post such questions in the Science-Chemistry section next time.

anonymous · Answer

So sorry, I thought I did! : /

miracrown · Answer

its alright, just be careful next time. =) 
And welcome to OS !