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09 Oct 2019, 23:08
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (01:23) correct
12%
(01:49)
wrong
based on 82
sessions
History
Date
Time
Result
Not Attempted Yet
The table above gives the distribution of two genetic characteristics, X and Y, in a population of 100 subjects. What is ratio of (number of subjects having X)/(number of subjects having Y)?
(A) 7/5
(B) 1/1
(C) 5/7
(D) 7/10
(E) 1/4
Attachment:
2018-02-05_1755.png [ 28.03 KiB | Viewed 2907 times ]
10 Oct 2019, 02:50
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35/50=70%=0.7
Option D
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Option D
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21 Feb 2022, 10:16
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Bunuel
The table above gives the distribution of two genetic characteristics, X and Y, in a population of 100 subjects. What is ratio of (number of subjects having X)/(number of subjects having Y)?
(A) 7/5
(B) 1/1
(C) 5/7
(D) 7/10
(E) 1/4
Attachment:
2018-02-05_1755.png
This question is perfectly suited for the Double Matrix Method, which can be used for questions featuring a population in which each member has two characteristics associated with it (aka overlapping sets questions).
Here, we have a population of subjects, and the two characteristics are:
- has X or doesn't have X
- has Y or doesn't have Y
So, we can set up our matrix as follows:
Now plug in the information from the table to get:
At this point we can see that, the number of subjects that have characteristic X = 25 + 10 = 35
And the number of subjects that have characteristic Y= 25 + 25 = 50
So, the ratio of subjects having X to the subjects having Y = 35/50 = 7/10
Answer: D
This question type is VERY COMMON on the GMAT, so be sure to master the technique.
To learn more about the Double Matrix Method, watch this video:
EXTRA PRACTICE QUESTION
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