16
400
25
25
16
16 divided by 0.04 = 400
16
1.3125
Well, 4 divided by 16 is 1/4, so 16 into 400 billion it must be 100 billion times that. That makes it 25 billion. Or if you like, 400 divided by 16 is 25, leading to the same answer.
5/16 or 0.3125
16 = 400/25
How about 32/2 = 16 as one example