4:2 can be represented as 4 / 2. Or in its proper form, 2.
30 / 2 = 15.
No, it is not, remember the values
It doubles every 4 hours, so after 24 hours there will be 6 doublings.
2^6 = 64
So, the population will be (3,000,000 * 64) or 192,000,000 in 24 hours.
The answer is B.
