19
I believe the answer is 19/150 38/2 = 19 300/2 = 150 19/2 = 9.5 9.5 is fractional, so 19 can't be divided anymore without it not being a whole number.
300
300 sextrillion divided by 300 billion = 1
300 divided by11753 = 0.02552539777078193
It can by 19 19 divided by 19 is1
100
3.3333
0.5833
300
30
0.33