Help pls (I need to make it 20 things so Im typing this)

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.

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss