Always add them all around and then divide the two and you should get the correct answer
The chosen topic is not meant for use with this type of problem.
If 25 offspring are born and 14 moose die per year that means every year the number of moose increases by 11.
550 + 11x = 550*2
(x: how many years taken to double the number of moose)
550 + 11x = 1100
11x = 550
x = 50 years
idk if this is right tho you should check again