BlueDragon2010 wrote:Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?
A) 60
B) 80
C) 100
D) 120
E) 140
A double-matrix would work well here.
An alternate approach:
Since 30% of the members have passed the test, 70% have not.
These 70% are composed of 12 members who took the course and 30 members who did not, for a total of 42 members.
Thus, 70% of the total number of members in the swim club -- in other words, 70% of the correct answer choice -- must be equal to 42.
The correct answer must be
A:
70% of 60 = 42.
The correct answer is
A.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at
[email protected].
Student Review #1
Student Review #2
Student Review #3
