Answer:
Basic answer 8/5 or 1.6 or 1 3/5 but see below.
Explanation:
Square Root 64 = 8
square Root 25 = 5
the basic answer is 8/5
If you are allowed sqrt(64) = +/- 8
and sqrt(25) = +/- 5 then you get
-8/-5 = 8/5
-8/5 = -8/5
8/-5 = 8/-5
8/5 = 8/5
Also possible is 1.6 and 1 3/5 and all it's variations. It depends on what you have been given for answers.