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If 20 percent of the students at a certain college take a writing

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Joined: 11 Oct 2017
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If 20 percent of the students at a certain college take a writing [#permalink]

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New post 16 Nov 2017, 17:56
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Question Stats:

54% (01:03) correct 46% (01:10) wrong based on 24 sessions

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If 20 percent of the students at a certain college take a writing class, what percent of the students at the college take a math class?

(1) 50 percent of the students who take a writing class also take a math class.

(2) 40 percent of the students who take a math class also take a writing class.




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[Reveal] Spoiler: OA

Kudos [?]: 7 [0], given: 84

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Re: If 20 percent of the students at a certain college take a writing [#permalink]

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New post 16 Nov 2017, 19:38
ladyrenee95 wrote:
If 20 percent of the students at a certain college take a writing class, what percent of the students at the college take a math class?

(1) 50 percent of the students who take a writing class also take a math class.

(2) 40 percent of the students who take a math class also take a writing class.




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Hi....

Individually each statement is clearly not sufficient..

So let's see them combined..
Let W be the number attending writing class and m be the number attending the math class.

Statement I and II both talk of the SAME set of people
So \(\frac{50w}{100}=\frac{40m}{100}.......w=0.8m\)...
But w is 20% of total.....
0.8m=0.2t......m=1/4t...
In% m=100t/4=25% of total
Sufficient

C
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Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html


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Re: If 20 percent of the students at a certain college take a writing [#permalink]

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New post 17 Nov 2017, 10:42
As in the attached pic.

C answer
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Kudos [?]: 210 [0], given: 298

Re: If 20 percent of the students at a certain college take a writing   [#permalink] 17 Nov 2017, 10:42
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If 20 percent of the students at a certain college take a writing

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