MS Excel adding problem, MS excel Summation problem

Hi and welcome to the new Tip:
Problem:
One of my friends asked me "When i tried to add numbers like 1,2 and 5,5 i get an error message and icannot do it".

Solution:

use the dot instead of the comma  . instead of ,  like this:
1.2+5.5  iinstead of 1,2 +5,5
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Wrong form:

correct form: