taken from GMAT PAPER TEST 55.
I know. It's simple. I'm searching for a method to do those questions. I "fell in love" with the double set matrix method, but i cannot apply it here correctly.
apart from solving this Q, I wonder how one knows how to approach thsoe word problems?
OA will folow.
In a sample of college students, 40 percent are third-year students and 70 percent are not second-year students. What fraction of those students who are not third-year students are second-year students?
let's put the total=100
third year+first year=70 ===== first year = 30
second year/first+second====30/60=1/2 OA D