Answer: Greg took 32 minutes on the third day.
Step-by-step explanation: Given that the mean of Greg’s journey times to work on 3 days was 28 minutes. It took him 27 minutes and 25 minutes on two of the days.
We are to find the time taken by him on the third day.
Let x minutes be the time taken by Greg on the third day.
Then, according to the given information, we have
[tex]\dfrac{27+25+x}{3}=28\\\\\\\Rightarrow \dfrac{52+x}{3}=28\\\\\Rightarrow 52+x=84\\\\\Rightarrow x=84-52\\\\\Rightarrow x=32.[/tex]
Thus, Greg took 32 minutes on the third day.
