Foundational Concepts Sample Work for algebra?

I need 5 examples? I need to upload

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.

If the measure of xyz is 81 what is the measure of yz

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?