half life mcat

So Idk if anyone else figured this out but if you take the half life equation and split it up it becomes a lot easier to solve. Taking the equation N(t)=No1/2^T/t1/2 you can do this: No/N(t)=x, 2^n =x, and finally n=T/t1/2 when the problem gives all variables except one it really just a...