Question

A bacteria culture begins with 4 bacteria which double in size every hour. How many bacteria exist in the culture after 8 hours?

A.128
B.256
C.1,024
D.8,192​

Answer 1

Option C. 1,024 bacteria

Explanation:

We are given that a bacteria culture begins with 4 bacteria which double in size every hour. And we have to find that how many bacteria exist in the culture after 8 hours;

So, Number of bacteria after one hour = 4 * 2 = 8

Number of bacteria after two hours = 8 * 2 = 16

Number of bacteria after three hours = 16 * 2 = 32

Number of bacteria after four hours = 32 * 2 = 64

Number of bacteria after five hours = 64 * 2 = 128

Number of bacteria after six hours = 128 * 2 = 256

Number of bacteria after seven hours = 256 * 2 = 512

Number of bacteria after eight hours = 512 * 2 = 1,024

Therefore, 1,024 bacteria exist in the culture after 8 hours .