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What fraction of the students at John Bob Memorial High School are nei

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What fraction of the students at John Bob Memorial High School are nei  [#permalink]

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New post Updated on: 24 Nov 2019, 10:06
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What fraction of the students at John Bob Memorial High School are neither ranchers nor farmers?

1. 3/4 of the students at John Bob Memorial High School are ranchers

2. Exactly 1/5 of the students at John Bob Memorial High School are farmers but not ranchers

Originally posted by kendrikFROMkenya on 24 Nov 2019, 08:37.
Last edited by Bunuel on 24 Nov 2019, 10:06, edited 1 time in total.
Renamed the topic.
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Re: What fraction of the students at John Bob Memorial High School are nei  [#permalink]

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New post 24 Nov 2019, 20:10
kendrikFROMkenya wrote:
What fraction of the students at John Bob Memorial High School are neither ranchers nor farmers?

1. 3/4 of the students at John Bob Memorial High School are ranchers

2. Exactly 1/5 of the students at John Bob Memorial High School are farmers but not ranchers



Draw a 2 by 2 matrix
........R .......NR..,.Total
F......a ......x/5...
NF....b. ........c.....
.... 3x/4......x/4....x

Combined we get x/5+c=x/4.....c=x/4-x/5=x/20

Hence answer is 1/20th

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Re: What fraction of the students at John Bob Memorial High School are nei   [#permalink] 24 Nov 2019, 20:10
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What fraction of the students at John Bob Memorial High School are nei

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