Answer:
t < 3.8 minutes
Step-by-step explanation:
We are told that the temperature "t" minutes after being cooled is
60(5/6)^t
We want to find After how many
minutes will the temperature of the solution be less than 30°C
Thus;
60(5/6)^t < 30
Divide both sides by 60 to get;
(5/6)^t < 0.5
t In(5/6) < In 0.5
-0.1823t < -0.6931
t < 0.6931/0.1823
t < 3.8 minutes
