Possible number of turns?

In my physics book there's a question that I do not quite understand:

The charger of a notebook provides a secondary voltage of 19V. Calculate possible number of turns of the primary coil and secondary coil.

So there are 19V and 230V but how should I calculate now because there must be 2 solutions or not?

There are many more than 2 solutions.

What you know is that the ratio between the primary and secondary coil must be max 230: 19.

The exact value depends on the type of charge regulator and the current requirement of the battery.