31,250
1/16
16
0.0438
0.0938
16/9
0.032
two-fourths = one-half one-half of 16 = 8 or (2 divided by 4) x 16 = 0.5 x 16 = 8
9/16
8 divided by .5 = 16
1/2 divided by 8/7 = 7/16
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.