Answer:
second one. what is the number?
Very Simple !
If ABCDE is that number then with given information we can rewrite the digits of that number as,
A B (B — 4) (B + 4) (4A)
A can take value either 1 or 2 as for A= 3, E = 12 i.e. 2 digit value & hence not acceptable !
B should be less than 6 to keep value of D limited to a single digit only ! & also greater than 3 simultaneously , so as to keep value of C at least greater than zero ! Thus B also can take 2 values only either 4 Or 5
So that 5 digit number is not unique but can take 4 values as follows !
(1) 14084
(2) 15194
(3) 24088
(4) 25198