" A population is "

The rate of growth of a population is proportional to the number present if the population of a city doubled in the past 25 years,and the present population is 100000, when will the city have a population of 500000?

If the rate of increase in population is r% per year, the population after n years is p, find the population that was n years before.

The population P in any year t is such that the rate of increase in the population is proportional to the population. Then

In a population the proportion of pre-reproductive individuals is high. The population is

The rapid increase in human population is called population crash.

The population of a city increase at a rate proportional to the population at that time. In 40 years the population is increased from 30,000 to 40,000 then after time t, the population is

The population of a town increases by 6% every year. If the present population is 15900, find its population a year ago.