Question

Scientists can estimate the number of bacteria in a refrigerated food using the formula 0.2b=t^2/20 where b is the number of bacteria and t is the time in seconds. What was the approximate time a food was in the refrigerator if there were 625 bacteria?

A. 30 seconds
B. 40 seconds
C. 50 seconds
D. 60 seconds

Answer 1

As we know the formula that is
0.2b = t^2 / 20
so by putting values
0.25[625=t^2 / 20
125=t^2 / 20
so 125*20=t^2
t=50 by taking square root
so correct option is C
hope it helps