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GMAT PREP2 DS

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GMAT PREP2 DS [#permalink] New post 08 Oct 2007, 13:06
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
plz explain..thx
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Re: GMAT PREP2 DS [#permalink] New post 08 Oct 2007, 13:23
12345678 wrote:
plz explain..thx


These are some nasty problems: i dunno id say btwn B or C.


I think B should be ok here.
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 [#permalink] New post 08 Oct 2007, 13:29
(B) for me :)

Stat 1
No information about Male and Female...

INSUFF.

Stat 2
Take the total amount of students equal to 100.

Let be:
> M : the number of male (actually it's the percentage we are looking for)
> F : the number of female

We have:
o M + F = 100
o 0.72*M + 0.8*F = 75

2 equations and 2 unknown variables.

SUFF.
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 [#permalink] New post 08 Oct 2007, 13:39
Fig wrote:
(B) for me :)

Stat 1
No information about Male and Female...

INSUFF.

Stat 2
Take the total amount of students equal to 100.

Let be:
> M : the number of male (actually it's the percentage we are looking for)
> F : the number of female

We have:
o M + F = 100
o 0.72*M + 0.8*F = 75

2 equations and 2 unknown variables.

SUFF.


Exactly what I had written down. I figured b/c we know .72M+.8F=75

And .28M+.2F=25 and M+F=100

Then i figured B was sufficient b/c its not looking for any real numbers here, just fraction/percentage.
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 [#permalink] New post 08 Oct 2007, 13:55
Fig wrote:
(B) for me :)

Stat 1
No information about Male and Female...

INSUFF.

Stat 2
Take the total amount of students equal to 100.

Let be:
> M : the number of male (actually it's the percentage we are looking for)
> F : the number of female

We have:
o M + F = 100
o 0.72*M + 0.8*F = 75

2 equations and 2 unknown variables.

SUFF.

ahh silly mistake..thx for explanation OA=B
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Re: GMAT PREP2 DS [#permalink] New post 08 Oct 2007, 21:29
12345678 wrote:
plz explain..thx


B for me too

assuming 100 again for total and X male applied

72X/100 + 80*(100-X)/ 100 = 75/100 * 100
gives X
And required is X/100
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 [#permalink] New post 09 Oct 2007, 11:16
Also go with B:

1. Insuff.

2. It's a mixture problem!

0.75(1) = 0.72(M) + 0.80(1-M)
M = 5/8
W = 3/8

Ans B.
  [#permalink] 09 Oct 2007, 11:16
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