And can you show your work and say which number you are answering you

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.

Answer this 30 points and brainliest!

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)