Does anyone know how to do this pleaseee?

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.

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Point a (7,3) is translated to a'(16,-9). which rule describes the translation?