How very high reading/listening but low speaking/writing TOEFL scores are usually judged on graduate admission? Can you please let me know how following TOEFL scores are usually judged on graduate (mainly master) admission if a) minimum requirement is 100 and b) minimum total requirement is 80 and minimum speaking requirement is 24?

Reading &amp; Listening: 29
Speaking &amp; Writing: 20

Probably I would not have the chance to provide this explanation to admission board however it may be worth mentioning here that I communicate very well in my native language and I can speak better in English without exam pressure. I have learned English on my own and I have not been able to practice speaking/writing enough.
Speaking ability is considered very important; the TOEFL is used to determine if you can speak well enough to teach as a TA at US universities.  Keep in mind teaching is also high pressure, like taking an exam.

These scores might do better with degree programs which do not require the graduate student to teach.

http://www.ets.org/toefl/ibt/scores/understand