Question 783496
"All digits are odd. I am less than 600 and greater than 400", so this means that the hundreds digit is 5


" My last digit is 7", so the units digit is 7.


"If you add my digits you get 15", if x is the tens digit, then 5+x+7 = 15 ---> x+12 = 15 ---> x = 3


The tens digit is 3


Summary


Hundreds Digit: 5
Tens Digit: 3
Units Digit: 7


Answer: <font color="red">537</font>