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Of the 50 students in a school, 30 have brown hair, 21 have
[#permalink]
02 Jul 2018, 05:56
02 Jul 2018, 05:56
Expert Reply
00:00
Question Stats:
90% (01:29) correct
10% (02:09) wrong based on 10 sessions
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Of the 50 students in a school, 30 have brown hair, 21 have blue eyes, and 9 have both brown hair and blue eyes. How many students have neither brown hair nor blue eyes?
A. 5
B. 6
C. 7
D. 8
E. 10
A. 5
B. 6
C. 7
D. 8
E. 10
Re: Of the 50 students in a school, 30 have brown hair, 21 have
[#permalink]
03 Jul 2018, 19:50
03 Jul 2018, 19:50
1
Carcass wrote:
Of the 50 students in a school, 30 have brown hair, 21 have blue eyes, and 9 have both brown hair and blue eyes. How many students have neither brown hair nor blue eyes?
A. 5
B. 6
C. 7
D. 8
E. 10
A. 5
B. 6
C. 7
D. 8
E. 10
Here,
this problem can be solved using matrix approach.
Plz see the diagram attached.
Fig -1 , put all the values that are given
Fig 2 - fill up the space in the table and we get students have neither brown hair nor blue eyes = 8
Attachments
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Untitled1.jpg [ 21.45 KiB | Viewed 3247 times ]
Re: Of the 50 students in a school, 30 have brown hair, 21 have
[#permalink]
09 Feb 2023, 08:37
09 Feb 2023, 08:37
1
Carcass wrote:
Of the 50 students in a school, 30 have brown hair, 21 have blue eyes, and 9 have both brown hair and blue eyes. How many students have neither brown hair nor blue eyes?
A. 5
B. 6
C. 7
D. 8
E. 10
A. 5
B. 6
C. 7
D. 8
E. 10
pure set question -
Total = A + B - Both + Neither
50 = 30 + 21 - 9 + Neither
50 - 30 - 21 + 9 = Neither
Neither = 8
D is the best answer
