Urgent! explain to me how to solve this. : )

The population increases by 500 each year, so multiply the number of years that have passed since 1990 by 500.

1999 - 1990 = 9 years

9 years * 500 = 4,500

Add 4,500 to 22,317 inhabitants.

22,317 + 4,500 = 26,817

Your answer is B) 26,817 inhabitants.

since both sides equal, there are infinitely many olutions.

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.