kobel51 wrote:Are at least 10 percent of the people in Country X who are 65 years old or older employed?
1) In Country X, 11.3 percent of the population is 65 years old or older.
2) In Country X, of the population 65 years old or older, 20 percent of the men and 10 percent of the women are employed
Let's use the term
seniors, to refer to those who are 65 years old or older.
Target question: Are at least 10 percent of Country X's seniors employed?
Statement 1: In Country X, 11.3 percent of the population is 65 years old or older.
Okay, so we know that a certain percent of the population are seniors, but we aren't told anything about their employment rates.
Since we cannot answer the
target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: Among Country X's seniors, 20 percent of the men and 10 percent of the women are employed
To get a feel for what this tells us, let's examine the two EXTREMES:
Extreme #1 - among the seniors, there are ZERO women. This means all of the seniors are men, which means
20% of the seniors are employed
Extreme #2 - among the seniors, there are ZERO men. This means all of the seniors are women, which means
10% of the seniors are employed
Now that we have examined the extremes, we have a range of values that represent the employment rate among Country X's seniors.
We can conclude:
10% < senior employment rate < 20%
In other words,
at least 10 percent of Country X's seniors are employed
Since we can answer the
target question with certainty, statement 2 is SUFFICIENT
Answer =
B
By the way, this concept (and others) is covered in our video on weighted averages:
https://www.gmatprepnow.com/module/gmat- ... ics?id=805
Cheers,
Brent
