1
Random Double Matrix Question #4
May 23, 2011: Welcome to the fourth installment of videos devoted to Double Matrix
questions.
What’s a Double Matrix question?
For those who missed the first article in this series, a Double Matrix question (also...
More

1
Random Double Matrix Question #4
May 23, 2011: Welcome to the fourth installment of videos devoted to Double Matrix
questions.
What’s a Double Matrix question?
For those who missed the first article in this series, a Double Matrix question (also known as
an Overlapping Sets question) is one that involves a certain population where each member
of that population has two characteristics associated with it.
Questions that fall into this
category can often be solved using the Double Matrix Method.
For an introductory lesson on the Double Matrix Method, please watch the video at
http://www.
youtube.
com/watch?v=OWD2t5jCCZQ
Afterwards, you can try solving this mid-range problem-solving question:
In a group of 100 cars, 47 cars do not have air conditioning.
If at least 51 cars
have racing stripes, what is the greatest number of cars that could have air
conditioning but not racing stripes?
A) 45
B) 47
C) 49
D) 51
E) 53
Once you’ve attempted the question, you c
Less