the rabbit population in a certain area is 500% of last year's population. there are 700 rabbits this year. how many were there last year

For this case we have the following data:

700 rabbits that represent 500% of the population of last year. So, to obtain the rabbit population of last year, we developed a rule of three:

700 -----------> 500%

x ---------------> 100%

Where x represents the rabbit population of last year.

Clearing x we have:

rabbits

In this way, last year there was a population of 140 rabbits.

140 rabbits