10. Fish don't drown (; nice try tho
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Multiply
on the numerator and denominator:


Multiply it by its self 3 times for example 2 to the square root of 3 2x2x2
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.