died were male rats

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Fri May 07, 2010 2:53 am

Forty percent of the rats included in an experiment were male rats. If some of the rats died during the experiment and 30 percent of the rats that died were male rats, what was the ratio of the death rate among the male rats to the death rate among the female rats?

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
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Source: Beat The GMAT — Quantitative Reasoning | Fri May 07, 2010 2:53 am

liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Fri May 07, 2010 9:41 am

Let total number of rat 100x and 100y rats dies in the experiment
hence
Total Died Death-rate
male 40x 30y 3y/4x
Female 60x 70y 7y/6x

So death rate of male rat : death rate of female rat=3y/4x :7y/6x =9:14

Ans 9:14

Last edited by liferocks on Fri May 07, 2010 4:48 pm, edited 1 time in total.

"If you don't know where you are going, any road will get you there."
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hephzi_bah: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Thu Apr 10, 2008 6:23 am; GMAT Score:800

by hephzi_bah » Fri May 07, 2010 2:28 pm

liferocks wrote:Let total number of rat 100x and 100y rats dies in the experiment
hence
Total Died Death-rate
male 40x 30y 4x/3y
Female 60x 70y 6x/7y

So death rate of male rat : death rate of female rat=4x/3y :6x/7y =14:9

Ans 14:9

Please let me correct it.

THE ANSWER IS 9:14
THANKS

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liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Fri May 07, 2010 4:47 pm

yea ..deth rate of female rates is 7y/6x not 6y/7x...corrected in the original post.

"If you don't know where you are going, any road will get you there."
Lewis Carroll

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Sat May 08, 2010 3:04 am

hephzi_bah wrote:
liferocks wrote:Let total number of rat 100x and 100y rats dies in the experiment
hence
Total Died Death-rate
male 40x 30y 4x/3y
Female 60x 70y 6x/7y

So death rate of male rat : death rate of female rat=4x/3y :6x/7y =14:9

Ans 14:9
Please let me correct it.

THE ANSWER IS 9:14
THANKS

Hey, I liked the idea of writing response in hand scripts. Please tell all of us how to show it like you did it here, I hope it would bring revolution among the post writers who might be globally identified by their hand writings rather by a mere name.

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Sat May 08, 2010 10:54 am

Yeah Sanju bhai.. i always wanted to write that way.. heard some sort of pen can be used to write on the screen..But wont that damage our screen???

But it looks fancy...

R&D on GMAT algorithm:

https://www.beatthegmat.com/r-d-on-gmat- ... tml#305739

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hephzi_bah: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Thu Apr 10, 2008 6:23 am; GMAT Score:800

by hephzi_bah » Mon May 10, 2010 11:05 am

sanju09 wrote:
hephzi_bah wrote:
liferocks wrote:Let total number of rat 100x and 100y rats dies in the experiment
hence
Total Died Death-rate
male 40x 30y 4x/3y
Female 60x 70y 6x/7y

So death rate of male rat : death rate of female rat=4x/3y :6x/7y =14:9

Ans 14:9
Please let me correct it.

THE ANSWER IS 9:14
THANKS

Hey, I liked the idea of writing response in hand scripts. Please tell all of us how to show it like you did it here, I hope it would bring revolution among the post writers who might be globally identified by their hand writings rather by a mere name.

Well dear GMATters:

First: use a tablet or something to write better than a simple mouse.
Second: When POST something use INSERT IMAGE ( the image there was recorded on the web address in it)
Third: Post it...

Sincerely
Alberto Vidal

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