Respuesta :
a whole, in fraction terms is 1, or in this case five fifths, or 5/5, that's the whole, collection.
so we know 25 is 1/5 of that, what is the whole? namely 5/5?
[tex]\bf \begin{array}{ccll} CDs&fraction\\ \cline{1-2} 25&\frac{1}{5}\\[0.8em] x&\frac{5}{5} \end{array}\implies \cfrac{25}{x}=\cfrac{~~\frac{1}{5}~~}{\frac{5}{5}}\implies \cfrac{25}{x}=\cfrac{~~\frac{1}{5}~~}{1}\implies \cfrac{25}{x}=\cfrac{1}{5} \\\\\\ \cfrac{25\cdot 5}{1}=x\implies 125=x[/tex]
