Hi, mussti,
LimeSurvey is not a statistic tool. The so called statistic only gives a very raw overview over frequencies.
You have three questions and in the raw LS overview you get the percentages of each question, but no combination.
The only thing you can do, is:
Filter by two of the three questions and have a look at the result.
Here I filtered the "females".
and got this
You see the right table only contains rhe result of the 526 filtered women.
But real analysis you do in a statistic tool like SPSS or PSPP (the open source clone of SPSS)
Or even EXCEL or OpenOffice/LibreOffice
Best regards
Joffm