How do i describe a balanced chemical equation?

Equal numbers of each atom on both sides of the equation.  If you're in high school or middle school, that definition is sufficient.  

If you are taking a college or AP chemistry course and dealing with redox reactions, electrons and free protons come into play as well.  I can elaborate if needed

To estimate the number of ladybugs in the entire garden, AJOYS NEEDS THE DIMENSION OF THE GARDEN.

In field work, in order to the determine the number of a particular organism that live in a particular habitat, all that a researcher need is the number of that organism that is found in one square meter of the habitat and the dimension of the whole habitat. With these parameters, the researcher can estimate the total number of that organism that live in that habitat.