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In a class of 30 students, 17 students study Chinese, and r

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Manager
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Joined: 11 Nov 2007
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In a class of 30 students, 17 students study Chinese, and r [#permalink]

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New post 18 Nov 2007, 22:13
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In a class of 30 students, 17 students study Chinese, and r students study japanese. Every student studies either Chinese, Japanese, or both. How many students study both Chinese and Japanese?

1. r = 14
2. 13 students take only Japanese

Why is the answer 1 only? I think 2 is okay well because:
we know from opening statement that, 30=17+r-both
Statement two tells us that 30=17+13-both. In this case, both equals 0

What am I missing? THANKS!

Kudos [?]: 9 [0], given: 0

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CEO
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Kudos [?]: 4493 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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 [#permalink]

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New post 18 Nov 2007, 22:27
:?

Kudos [?]: 4493 [0], given: 360

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Kudos [?]: 334 [0], given: 0

Re: Sets [#permalink]

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New post 19 Nov 2007, 12:42
aliensoybean wrote:
In a class of 30 students, 17 students study Chinese, and r students study japanese. Every student studies either Chinese, Japanese, or both. How many students study both Chinese and Japanese?

1. r = 14
2. 13 students take only Japanese

Why is the answer 1 only? I think 2 is okay well because:
we know from opening statement that, 30=17+r-both
Statement two tells us that 30=17+13-both. In this case, both equals 0

What am I missing? THANKS!


You are looking at #2 wrong.
For #2, ONLY Japaneses means this:
r-both = 13

r is defined as ALL Japaneses students, not ONLY Japanese students

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New post 19 Nov 2007, 13:52
Total = Set1 + Set2 + Neither - Both

30 = 17 + r + 0 - Both

statement 1

r = 14

30 = 17 + 14 + 0 - Both

Both = 1

sufficient

statement 2

insufficient

Both = r - 13 ?

the answer is (A)

Kudos [?]: 240 [0], given: 0

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CEO
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Joined: 17 Nov 2007
Posts: 3585

Kudos [?]: 4493 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
GMAT ToolKit User Premium Member
 [#permalink]

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New post 19 Nov 2007, 14:06
I cry :cry:
#2 insufficient means a few cases. It is clearly for me that 13+17 is good and is single case..... :(

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Manager
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New post 19 Nov 2007, 21:47
The second statement basically gives you this equation.

Only Chinese + (both chinese and japanese) = 17.

Therefore, statement 2 is insufficient.

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Director
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Re: Sets [#permalink]

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New post 19 Nov 2007, 22:42
aliensoybean wrote:
In a class of 30 students, 17 students study Chinese, and r students study japanese. Every student studies either Chinese, Japanese, or both. How many students study both Chinese and Japanese?

1. r = 14
2. 13 students take only Japanese

Why is the answer 1 only? I think 2 is okay well because:
we know from opening statement that, 30=17+r-both
Statement two tells us that 30=17+13-both. In this case, both equals 0

What am I missing? THANKS!


Both does not equal 0. Neither equals 0. Both = r-13.

Kudos [?]: 241 [0], given: 0

Manager
Manager
User avatar
Joined: 11 Nov 2007
Posts: 60

Kudos [?]: 9 [0], given: 0

 [#permalink]

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New post 20 Nov 2007, 22:37
makes sense, thanks a lot guys!

Kudos [?]: 9 [0], given: 0

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CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3585

Kudos [?]: 4493 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
GMAT ToolKit User Premium Member
 [#permalink]

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New post 22 Nov 2007, 05:54
:roll: thanks!

Kudos [?]: 4493 [0], given: 360

  [#permalink] 22 Nov 2007, 05:54
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In a class of 30 students, 17 students study Chinese, and r

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