If there are 92 students and 20 students take the bus home, the number of students who haven't taken the bus is 92-20 = <<92-20=72>>72 students.
5/8 of the students who didn't take the bus home ride bikes home, a total of 5/8* 72 = <<5/8*72=45>>45 students.
The number of students who neither took the bus nor biked home but walked home is 72-45 = <<72-45=27>>27
#### 27