GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 18 Dec 2018, 02:59

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### Happy Christmas 20% Sale! Math Revolution All-In-One Products!

December 20, 2018

December 20, 2018

10:00 PM PST

11:00 PM PST

This is the most inexpensive and attractive price in the market. Get the course now!
• ### Key Strategies to Master GMAT SC

December 22, 2018

December 22, 2018

07:00 AM PST

09:00 AM PST

Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

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

Author Message
TAGS:

### Hide Tags

Intern
Joined: 11 Oct 2017
Posts: 22
If 20 percent of the students at a certain college take a writing  [#permalink]

### Show Tags

16 Nov 2017, 17:56
1
00:00

Difficulty:

55% (hard)

Question Stats:

57% (01:49) correct 43% (01:32) wrong based on 33 sessions

### HideShow timer Statistics

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.

Math Expert
Joined: 02 Aug 2009
Posts: 7112
Re: If 20 percent of the students at a certain college take a writing  [#permalink]

### Show Tags

16 Nov 2017, 19:38
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.

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
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

DS Forum Moderator
Joined: 21 Aug 2013
Posts: 1412
Location: India
Re: If 20 percent of the students at a certain college take a writing  [#permalink]

### Show Tags

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

Attachments

IMG_20171118_000415.jpg [ 1.67 MiB | Viewed 477 times ]

Re: If 20 percent of the students at a certain college take a writing &nbs [#permalink] 17 Nov 2017, 10:42
Display posts from previous: Sort by