A certain shade of gray paint is obtained by mixing 3 parts : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 22 Jan 2017, 22:40

### 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

# A certain shade of gray paint is obtained by mixing 3 parts

Author Message
Manager
Joined: 05 Jul 2006
Posts: 197
Followers: 1

Kudos [?]: 61 [0], given: 0

A certain shade of gray paint is obtained by mixing 3 parts [#permalink]

### Show Tags

08 Sep 2006, 18:35
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.

A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of black paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half- gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture?
VP
Joined: 02 Jun 2006
Posts: 1267
Followers: 2

Kudos [?]: 80 [0], given: 0

### Show Tags

08 Sep 2006, 18:59
Ratio of white to black = 3/5

To get 2 gallons,

3x + 5x = 2

x = 2/8 = 1/4 = 0.25

Required White Paint = 0.75
Required Black Paint = 1.25

Paint can be purchased only in 1 gallon or 0.5 gallon sizes.

White Purchase = 1 gallon
Black Purchase = 1.5 gallons
CEO
Joined: 20 Nov 2005
Posts: 2911
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 24

Kudos [?]: 273 [0], given: 0

### Show Tags

08 Sep 2006, 21:21
White required = 2*3/8 = 3/4 - Must purchase 1 gallon
Black required = 2*5/8 = 5/4 - Must purchase 1.5 gallons

Total to be purchased = 2.5 gallons
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Current Student
Joined: 29 Jan 2005
Posts: 5238
Followers: 25

Kudos [?]: 378 [0], given: 0

### Show Tags

09 Sep 2006, 03:11
haas_mba07 wrote:
Ratio of white to black = 3/5

To get 2 gallons,

3x + 5x = 2

x = 2/8 = 1/4 = 0.25

Required White Paint = 0.75
Required Black Paint = 1.25

Paint can be purchased only in 1 gallon or 0.5 gallon sizes.

White Purchase = 1 gallon
Black Purchase = 1.5 gallons

Textbook explanation
Intern
Joined: 23 Aug 2006
Posts: 8
Followers: 0

Kudos [?]: 1 [0], given: 0

### Show Tags

09 Sep 2006, 07:32
0.75 W & 1.25 B- Since only 1 Gallon and 1/2 gallon are available,

we need 1 G White & 1.5 G Black totalling to 2.5 Gallon
09 Sep 2006, 07:32
Display posts from previous: Sort by