
Arturo O. answered 07/08/18
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The population P(t) obeys the law
P(t) = P0 (2)t/10,
where t is the time in minutes from when the population was P0.
60 minutes ago, P was P0. Now it is 19683.
t = 60 minutes
19683 = P0 (2)60/10 = P0 (2)6
P0 = 19683 / 26 = 308 (to the nearest whole number)