Ein kleiner Puzzle-Cache Mystery Cache

Don't bother going to the given coordinates, they will take you to Durham University's Centre for Foreign Language Study, that will only help for the German part of this puzzle.  The maths department may be of more help.

A simple arithmetic problem with a little German thrown in, or is it?; First you need to count from 0 to 49 in German.

All numbers can also be represented by letters, such as 0 = NULL and 3 = DREI. The numbers from 0 to 49 can thus be formed by a total of 19 different letters, ß = ss, ö = oe and ü = ue.
For all these numbers between 0 and 49, the sum is now formed from the letters, the result is equal to the number itself, for example N + U + L + L = 0 and D + R + E + I = 3. Now you just have to set up all 50 equations according to this scheme and solve. In all equations, the letters have the same value. Some of the numbers are integers and others are rational numbers but are all between -100 and 100.; Whether you prefer to use pencil or pc is up to you.

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