there are 5 more girls than boys in a class if 2 boys join the class, the ratio of girls to boys Will be 5:4 find the (i) number of girls in the class. (ii) find the total number of pupils in the class. (iii) find the probability of selecting a boy as the class prefect​

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.

41/17 as a decimal rounded to the nearest hundredth

I'm confused on this could anyone me and show me what i need to do to solve it.