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

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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
[Reveal] Spoiler: OA

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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
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] 03 Jul 2018, 19:50
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Of the 50 students in a school, 30 have brown hair, 21 have

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