Question

A substance has a half-life of 6 years. If 20 pounds are present initially, how much will remain after 2 years?

Answer 1

16.66pound

Explanation:

roughly 16.66 pound

if in 6 years it become half which is =10

then 10÷6= 1.67

then 1.67 pound is decayed every year.

in 2 years it decay 1.67×2= 3.34

so , the remaining is 20-3.34=16.66pound