pond water

Question

water from a certain pond contains an average of 4.9 specimens of species Z per cubic centimeter. How many specimens of species Z are contained in 1 cubic millimeter of pond water?

Answer 1

Hi Rose,

 

Let's first compare a cubic cm to a cubic ml

 

Recall that there are 10 ml in a cm.

So there are 10³ = 1000 cubic ml in a cubic cm.

 

If there are 4.9 specimens of species Z in a cubic cm, there there are

4.9/1000 specimens of species Z in a cubic ml.