If I had 185 m&m's over a period of 10 hours predict the time when half the m&m's would be left using half life

Assuming this is homework, please post your answer and someone will come along to agree or disagree.

Assuming this is homework, please post your answer and someone will come along to agree or disagree.

I got an equation t=L[ln(n/no)/Ln(1/2)]

but it makes no sense. Is the equation even correct?

A couple of equivalent approaches to solving for time t (which it appears you're shooting for), starting with the basic half-life relationship...

\frac{1}{2} \ = \ e^{-rt}\ \ \Longrightarrow \ \

ln\frac{1}{2} \ = \ -rt \ \ \Longrightarrow \ \

-\frac{ln\ 1/2}{r} \ = \ t

Or a slightly different route to the same destination...

\frac{1}{2} \ = \ (e^t)^{-r}\ \ \Longrightarrow\ \

\frac{1}{2}^{(-1/r)} \ = \ e^t \ \ \Longrightarrow \ \

\left(-\frac{1}{r}\right)ln\frac{1}{2} \ = \ -\frac{ln(1/2)}{r} \ = \ t

Hope that helped a bit. P.S.: Around my house M&Ms have a half-life measured in milliseconds.