Math Is Fun Forum

I can think of two different situations:
1) I close my eyes and choose a class at random and go in the class and pick a student and came back to my office.  I found the student is a girl student.
    what is the probability she is from Abel's class ---- answer= 3/5
2) All the students from two classes are mixed up in the playground.  I close my eyes and pick a student.  when i opened the eyes it was a girl student.
    what is the probability she is from Abel's class --- answer=12/22