GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
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
Hide Show timer Statistics
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
Untitled.jpg [ 20.33 KiB | Viewed 2766 times ]
Untitled1.jpg [ 21.45 KiB | Viewed 2748 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
