The population of brasilia, brazil's capital, is about 1/85 of the country's population. what fraction of the total population of south america lives in brasilia?

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

Find the solution of this system of equation -7x+y=-20 9x-3y=36