Question

I am greater than 30 and less than 40 the sum of my digits is less than 5

Answer 1

31. 
31 is > 30.
31 is < 40.
3 + 1 = 4.

Answer 2

Answer is 31

30<x<40

x=(y+z)<5

3+1=4
3+2=5 Nope and anything higher is Nope