Zack had 2/3 of the lawn left to cut. after lunch, he cut 3/4 ig the grass he had left. how much of the whole lawn did zack cut after lunch

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.

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

Need on this geometry question. explain how you did it.