Below is the side view of a uniformly tapering wedge. The wedge narrows uniformly towards its right end.

The thickness at the left end is 20.0 mm, and at the right end, it is 10.0 mm. The length of the wedge L is 245.9 mm.

What is the thickness of the wedge at point x, which is 24.9 mm from the left end of the wedge?

Provide the result to an accuracy of 0.1 mm.