Kimberly77
Bunuel
Do at least 60 percent of the students in Pat’s class walk to school?
(1) At least 60 percent of the female students in Pat’s class walk to school.
(2) The number of students in Pat’s class who walk to school is twice the number of students who do not walk to school.
Kudos for a correct solution.
Hi
BrentGMATPrepNow, Given is W <=60%?
In St 2, W = 2N . Threfore I mark it as E. How's it possible to put both walk and not walk under one variable here (total 3W) and how to overcome this type of error? Thanks Brent
Whenever you use a variable, you should make sure you have a clear understanding of what that variable represents.
In your equation W = 2N, you are saying that:
W = the
number of students in Pat’s class who walk to school
N = the
number of students in Pat’s class who don't walk to school
So, the total
number of students in Pat's class = (number of students who walk to school) + (number of students who don't walk to school)
= W + N
= 2N + N
[after we substitute 2N for W]=
3NIf 3N = the total number of students in Pat's class, and W students walk to school, then the FRACTION of students who walk to school = W/
3NSubstitute 2N for W to get: the FRACTION of students who walk to school = 2N/
3NFrom here, all we need to recognize is that 2N/
3N = 2/3 = 66.6666...%
So the answer to the target question is "YES, at least 60 percent of the students in Pat’s class walk to school"
So statement 2 is sufficient