Answer :
To determine the fraction of the 300 fish that Nita caught, first, we determine the number of fish that Chris caught. The 45% of 300 is:
[tex]300*\frac{45}{100}=135.[/tex]Now, in total Chris, Nita and Craig caught 300 fish, therefore:
[tex]135+x+25=300.[/tex]x represents the number of fish caught by Nita.
Solving the above equation for x, we get:
[tex]x=300-25-135=140.[/tex]Therefore, Nina caught
[tex]140[/tex]out of the 300 fish, which is represented by the fraction:
[tex]\frac{140}{300}.[/tex]Finally, simplifying the above fraction, we get:
[tex]\frac{7}{15}.[/tex]