Answer :

To compare between the numbers take the nber as a percentage or a fraction:
(8/8754)*100=0.091%
(8/4839)*100=0.165%
0.165 is greater than 0.091 so the value of 8 in Tim number is greater.

In an easier way the greater the donominator the lower the value of that number. Hence 8/8754 is less than 8/4839
3915 is the answer cause if you subtract the numbers but greater to least so you get 3915