Unweighted out of 4, then what is weighted out of 5 or 6?

This may be a silly question, but here it goes. My school has the following weightings:

Regular classes are out of 4.
Honors classes are out of 5
and AP are out of 6.

So, if a person takes a mix of regular and honors, is his weighted GPA out of 5 since he only took regular and honors courses or is it out of 6 because AP classes were offered at the school?