It is currently 23 Oct 2017, 10:52

### 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 June
Open Detailed Calendar

# m25 Q9

Author Message
Intern
Joined: 22 Dec 2009
Posts: 40

Kudos [?]: 93 [0], given: 13

### Show Tags

06 Jan 2010, 02:05
Can someone plz help me explain how to solve this...

thanks

If the productivity of a brigade grows by 10% when the number of the workers in the brigade is increased by one, then which of the following is closest to the ratio of the productivity of a 12-person brigade to that of a 10-person brigade?

(A) 0.21
(B) 0.82
(C) 1.20
(D) 1.21
(E) 1.44

Kudos [?]: 93 [0], given: 13

Math Forum Moderator
Joined: 02 Aug 2009
Posts: 4994

Kudos [?]: 5531 [0], given: 112

### Show Tags

06 Jan 2010, 05:40
take prod of 10 person be x..
so of 11 people it will be 1.1x.. and 12 people=1.1x*1.1=1.21x..
reqd ratio=1.21x/x=1.21
_________________

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

Kudos [?]: 5531 [0], given: 112

Intern
Joined: 22 Dec 2009
Posts: 40

Kudos [?]: 93 [0], given: 13

### Show Tags

10 Jan 2010, 05:15
chetan2u wrote:
take prod of 10 person be x..
so of 11 people it will be 1.1x.. and 12 people=1.1x*1.1=1.21x..
reqd ratio=1.21x/x=1.21

I still dont understand the 12pep part..
Q says, 10% increase by one number increase then for 12pep isnt it suppose to be,
1.1x*0.1=?
could you please explain me how you came up with dividing by 1.1??!!

thanks

Kudos [?]: 93 [0], given: 13

Math Forum Moderator
Joined: 02 Aug 2009
Posts: 4994

Kudos [?]: 5531 [0], given: 112

### Show Tags

10 Jan 2010, 06:27
gmatJP wrote:
chetan2u wrote:
take prod of 10 person be x..
so of 11 people it will be 1.1x.. and 12 people=1.1x*1.1=1.21x..
reqd ratio=1.21x/x=1.21

I still dont understand the 12pep part..
Q says, 10% increase by one number increase then for 12pep isnt it suppose to be,
1.1x*0.1=?
could you please explain me how you came up with dividing by 1.1??!!

thanks

hi ..if with each person increased , prod increases by 10%...
1.1x*0.1 gives you the increase,which is 10% of the prod of 11 people but to get total we have to add these incr to prod of 11 person =1.1x+.11x=1.21x..
_________________

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

Kudos [?]: 5531 [0], given: 112

Re: m25 Q9   [#permalink] 10 Jan 2010, 06:27
Display posts from previous: Sort by

# m25 Q9

Moderator: Bunuel

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.