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Of the 200 seniors at Monroe High School, exactly 40 are in : Numeric Entry Question

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Of the 200 seniors at Monroe High School, exactly 40 are in [#permalink]
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Carcass wrote:
Of the 200 seniors at Monroe High School, exactly 40 are in the band, 60 are in the orchestra, and 10 are in both. How many seniors are in neither the band nor the orchestra?

Show: :: OA
110


Let's use the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it (aka overlapping sets questions)..

Here, we have a population of seniors, and the two characteristics are:
- in band or not in band
- in orchestra or not in orchestra

From the given information, we can set up our matrix as follows:
Attachment:
Of the 200 seniors at Monroe High School, exactly 40 are in the band1.png
Of the 200 seniors at Monroe High School, exactly 40 are in the band1.png [ 4.72 KiB | Viewed 9432 times ]




Since there are 200 students in total, we can add some additional values:
Attachment:
Of the 200 seniors at Monroe High School, exactly 40 are in the band2.png
Of the 200 seniors at Monroe High School, exactly 40 are in the band2.png [ 5.49 KiB | Viewed 9463 times ]



Now complete the matrix:
Attachment:
Of the 200 seniors at Monroe High School, exactly 40 are in the band3.png
Of the 200 seniors at Monroe High School, exactly 40 are in the band3.png [ 6.16 KiB | Viewed 9449 times ]


Answer: There are 110 seniors who are in neither the band nor the orchestra

This question type is COMMON on the GRE, so be sure to master the technique.

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Re: Of the 200 seniors at Monroe High School, exactly 40 are in [#permalink]
110
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Re: Of the 200 seniors at Monroe High School, exactly 40 are in [#permalink]
I took "exactly 40" as only 40 in Band & not orchestra, hence I got a different answer. The question should have explicitly mentioned that point right?

GreenlightTestPrep wrote:
Carcass wrote:
Of the 200 seniors at Monroe High School, exactly 40 are in the band, 60 are in the orchestra, and 10 are in both. How many seniors are in neither the band nor the orchestra?

Show: :: OA
110


Let's use the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it (aka overlapping sets questions)..

Here, we have a population of seniors, and the two characteristics are:
- in band or not in band
- in orchestra or not in orchestra

From the given information, we can set up our matrix as follows:
Attachment:
Of the 200 seniors at Monroe High School, exactly 40 are in the band1.png




Since there are 200 students in total, we can add some additional values:
Attachment:
Of the 200 seniors at Monroe High School, exactly 40 are in the band2.png



Now complete the matrix:
Attachment:
Of the 200 seniors at Monroe High School, exactly 40 are in the band3.png


Answer: There are 110 seniors who are in neither the band nor the orchestra

This question type is COMMON on the GRE, so be sure to master the technique.

RELATED VIDEO
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Re: Of the 200 seniors at Monroe High School, exactly 40 are in [#permalink]
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Chaithraln2499 wrote:
I took "exactly 40" as only 40 in Band & not orchestra, hence I got a different answer. The question should have explicitly mentioned that point right?


I think the wording is consistent with official GRE questions.
For example:
- https://gre.myprepclub.com/forum/in-a-grad ... -1815.html
- https://gre.myprepclub.com/forum/set-a-has ... -2337.html
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Re: Of the 200 seniors at Monroe High School, exactly 40 are in [#permalink]
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Re: Of the 200 seniors at Monroe High School, exactly 40 are in [#permalink]
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