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In a group of 70, every member speaks English or French. How many

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Manager
Manager
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G
Joined: 07 Jun 2017
Posts: 175

Kudos [?]: 88 [0], given: 59

Location: India
Concentration: Technology, General Management
GMAT 1: 660 Q46 V38
GPA: 3.6
WE: Information Technology (Computer Software)
GMAT ToolKit User
In a group of 70, every member speaks English or French. How many [#permalink]

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New post 26 Oct 2017, 22:35
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A
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E

Difficulty:

  85% (hard)

Question Stats:

30% (00:53) correct 70% (00:56) wrong based on 44 sessions

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In a group of 70, every member speaks English or French. How many members speak only French?

(1) 50 members speak English.
(2) 10 members speak both English and French.
[Reveal] Spoiler: OA

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Naveen
email: nkmungila@gmail.com
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Kudos [?]: 88 [0], given: 59

Manager
Manager
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S
Joined: 05 Dec 2016
Posts: 229

Kudos [?]: 25 [0], given: 48

Concentration: Strategy, Finance
GMAT 1: 620 Q46 V29
GMAT ToolKit User
Re: In a group of 70, every member speaks English or French. How many [#permalink]

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New post 26 Oct 2017, 23:44
Total=English+French+Both
70=English+French+Both
(1) 50 persons speak english, including both, so we have got the value for 2 out of 3 variables from the equation above, substituting:
70=50(English+Both)+French
French=70-50=20
Sufficient
(2) 10 person both speak english and french, that gives us value for 1 out of 3 variables from tha equation above, hence Insufficient.

Answer A

Kudos [?]: 25 [0], given: 48

Re: In a group of 70, every member speaks English or French. How many   [#permalink] 26 Oct 2017, 23:44
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In a group of 70, every member speaks English or French. How many

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