Question

The length of a particular bacteria cell is 1.5×10­−7 meters, and the length of a human red blood cell is 9×10−6 meters. How many times larger is the red blood cell as compared to the bacteria cell?

Answer 1

60

Explanation:

The ratio of sizes is ...

blood cell / bacteria = 9×10^-6/(1.5×10^-7) = 90×10^-7/(1.5×10^-7)

= 90/1.5 = 60

The red blood cell's length is 60 times that of the bacteria.