Given that Mrs. Baker phone 25 shells on the beach, and the brought 2/5 of the shells to class.
[tex]\begin{gathered} \text{total T = 25} \\ \text{fraction brought to class }f(C)=\frac{2}{5} \end{gathered}[/tex]The number of shells she bring to class will be the product of the fraction and the total;
[tex]\begin{gathered} n(C)=f(C)\times T \\ n(C)=\frac{2}{5}\times25 \\ n(C)=10 \end{gathered}[/tex]Therefore, the number of shells she bring to class is;
[tex]10[/tex]