thirtieth
the thirtieth floor
the thirtieth floor
21st written as a word
the twenty-first century
طبقه بیستم
the thirteenth day
the twelfth grade
the eleventh person
the tenth person
coming after nine other things in a series
the tenth person
the ninth day
the eighth grade
coming after seven other things in a series
the eighth grade
the seventh class
coming after six other things in a series
the seventh class