The number of persons rose by 20% to 30,942 in a year. What was the populatio originally a year ago?

25585 25785 25758 23785

25785

Let the population a year ago be x.  So, x + 20% of x = 30942  x + \(\frac{20x}{100}\) = 30942  x × \(\frac{x}{5}\) = 30942 \(\frac{6x}{5}\) = 30942 x = 25785