Basically for this question the rule is to DIVIDE THE FIRST NUMBER YOU SEE BY 2 like this:
64/2= 32
32/2= 16
16/2= 8
8/2= 4
After you've done this, you realise you get back the numbers which are 32, 16, 8 and 4.
So remember, if you see a question like this, just try to calculate the smaller numbers first like:
4 + ? = 8
The answer is 4
Then you work out the other numbers:
8 + ?= 16
The answer is 8
As you've noticed in this, the answer you are getting is DOUBLED.
HOPE YOU UNDERSTAND. IF YOU DON'T I'LL TRY TO EXPLAIN IT EASIER FOR YOU.
