It is currently 17 Oct 2017, 18:00

### 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

# How many ounces of pure water must be added to 50 ounces of

Author Message
VP
Joined: 09 Jul 2007
Posts: 1098

Kudos [?]: 141 [0], given: 0

Location: London
How many ounces of pure water must be added to 50 ounces of [#permalink]

### Show Tags

10 Dec 2007, 16:00
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How many ounces of pure water must be added to 50 ounces of a 15% saline solution to make a saline solution that is 10% salt?

Kudos [?]: 141 [0], given: 0

CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4576 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

### Show Tags

10 Dec 2007, 16:07
25.

c1=m/V
c2=m/(V+∆V)

c2=c1*V/(V+∆V) ==> ∆V=(c1/c2)V-V ==> ∆V=V(c1-c2)/c2

∆V=50*0.05/0.10=25

Kudos [?]: 4576 [0], given: 360

Director
Joined: 08 Jun 2007
Posts: 575

Kudos [?]: 109 [0], given: 0

### Show Tags

10 Dec 2007, 17:09
well this is how i do..[/img]

btw..whats alligation tech ?
Attachments

sol.jpg [ 10.71 KiB | Viewed 948 times ]

Kudos [?]: 109 [0], given: 0

VP
Joined: 09 Jul 2007
Posts: 1098

Kudos [?]: 141 [0], given: 0

Location: London

### Show Tags

10 Dec 2007, 17:41
thread teaches you the alligation technique

http://www.gmatclub.com/forum/t36604

Kudos [?]: 141 [0], given: 0

10 Dec 2007, 17:41
Display posts from previous: Sort by