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Of the 50 students in a school, 30 have brown hair, 21 have

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Carcass
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Of the 50 students in a school, 30 have brown hair, 21 have [#permalink] New post   02 Jul 2018, 05:56
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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
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pranab223
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Re: Of the 50 students in a school, 30 have brown hair, 21 have [#permalink] New post   03 Jul 2018, 19:50
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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


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
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Re: Of the 50 students in a school, 30 have brown hair, 21 have [#permalink] New post   09 Feb 2023, 08:37
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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


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
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gmatclubot
Re: Of the 50 students in a school, 30 have brown hair, 21 have [#permalink]
09 Feb 2023, 08:37
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