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The table above gives the distribution of two genetic characteristics,
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13 Apr 2022, 02:00
13 Apr 2022, 02:00
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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
Part of the project: GRE Quantitative Reasoning Daily Challenge - (2022) EDITION
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
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Re: The table above gives the distribution of two genetic characteristics,
[#permalink]
13 Apr 2022, 09:05
13 Apr 2022, 09:05
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Carcass wrote:
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
Part of the project: GRE Quantitative Reasoning Daily Challenge - (2022) EDITION
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
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
gmatclubot
Re: The table above gives the distribution of two genetic characteristics, [#permalink]
13 Apr 2022, 09:05
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