Answer :

25:10 can be writen as

[tex]\frac{25}{10}[/tex]

Since the numerator and the denominator are divisible by 5, then we have

[tex]\frac{25}{10}=\frac{5\times5}{5\times2}=\frac{5}{2}[/tex]

Then, an equivalent ratio of 25:10 is 5:2