Can someone answer my question?i need help i’m already failing i’ll give brainlist and points:/

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.

Find the given elements if matrix d:

In the rectangle below ac=30 units what is de