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
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