what is 125 out of 5%

The question does not really make much sense to me although anon's interpretation is alright :)

Anon, your working is good :)

 

Cross Multiply 

5*125= 625

100*x= 100x

Set up Equation

100x=625

Isolate the x by dividing both sides by 100, so that x is equal to 6.25.

 

$$\left({\frac{{\mathtt{5}}}{{\mathtt{100}}}}\right) = \left({\frac{{\mathtt{x}}}{{\mathtt{125}}}}\right) \Rightarrow {\mathtt{x}} = {\frac{{\mathtt{25}}}{{\mathtt{4}}}} \Rightarrow {\mathtt{x}} = {\mathtt{6.25}}$$