Hyeyoung
what is the total population of a metropolitan area consisting of central city with a population of 1.1 million and surrounding suburbs?
(1) The average population of 6 suburbs in the metropolitan area is 50,000
(2) The ratio of the population of the central city to the combined population of all the suburbs in the metropolitan area is 1 to 3
Statement 1(1) The average population of 6 suburbs in the metropolitan area is 50,000We're given the average population of 6 suburbs, however we don't know if the metropolitan area has only 6 suburbs. Hence, the information is not sufficient.
We can eliminate A and D.
Statement 2(2) The ratio of the population of the central city to the combined population of all the suburbs in the metropolitan area is 1 to 3As the ratio of the ratio of the population of the central city to the combined population of all the suburbs in the metropolitan area is given we can calculate the combined population of all the suburbs.
Population of metropolitan area = population of the central city + combined population of all the suburbs
Hence, this statement is sufficient.
Option B