What is 19/6 as a decimal

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.

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Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.