Question

While testing a new vaccine, a lab technician noticed that the number of bacteria reduced by half every minute. How long does it take for 3,000 bacteria to reduce to 375?

Answer 1

As we know that 
x=x0*[1/2]n
putting the values 
375=3000*[1/2]n
375/3000=[1/2]n
1/8=[1/2]n
simplify
[1/2]3=[1/2]n
by cancelling them
so n=3
so it will take 3 minutes
hope it helps