1. 5 < y < 2
This asks for all whole numbers y which are greater than 5
and also less than 2.
That's a contradiction so there are no such whole numbers.
Answer: none
2. 28 < y < 31.2
This asks for all whole numbers y which are greater than 28
and also less than 31.2
That's OK, NOT a contradiction, because 29, 30, and 31 are greater
than 28 and also less than 31.2
Answer: (29, 30, 31}
Edwin