Please help its two step equations

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

Tom drove 206 miles in 3.9 hours. estimate his average speed.