Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Nov 2015, 14:59

### 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 June
Open Detailed Calendar

# A contractor combined x tons of a gravel mixture that contained 10 per

Author Message
TAGS:
Manager
Joined: 13 Jan 2009
Posts: 171
Followers: 4

Kudos [?]: 21 [0], given: 9

A contractor combined x tons of a gravel mixture that contained 10 per [#permalink]  02 Sep 2009, 01:50
1
This post was
BOOKMARKED
00:00

Difficulty:

65% (hard)

Question Stats:

50% (02:04) correct 50% (01:33) wrong based on 82 sessions
A contractor combined x tons of a gravel mixture that contained 10 percent gravel G, by weight, with y tons of a mixture that contained 2 percent gravel G, by weight, to produce z tons of a mixture that was 5 percent gravel G, by weight. What is the value of x ?

(1) y = 10
(2) z = 16

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-contractor-combined-x-tons-of-a-gravel-mixture-that-102681.html
[Reveal] Spoiler: OA
 Kaplan Promo Code Knewton GMAT Discount Codes Manhattan GMAT Discount Codes
Senior Manager
Joined: 23 Jun 2009
Posts: 353
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Followers: 5

Kudos [?]: 103 [0], given: 63

Re: A contractor combined x tons of a gravel mixture that contained 10 per [#permalink]  02 Sep 2009, 01:58
x.10%+y.2%=z.5% x+y=z so it makes
x.10%+y.2%=(x+y).5%
x.10%+y.2%=x.5%+y.5%=
x.5%=y.3%
5x=3y
x=3y/5
z=8y/5
so if we know either y or z we can find x.
i.e. 1 and 2 suff, D.
Manager
Joined: 15 Jun 2009
Posts: 164
Followers: 2

Kudos [?]: 32 [0], given: 8

Re: A contractor combined x tons of a gravel mixture that contained 10 per [#permalink]  03 Sep 2009, 21:17
One eq. will be 10x + 2y = 5z

Other eq, x+y=z

Stmt 1 : y =10 ..suff 3 equation...3 variable

Stmt 2 : z = 16 ..suff 3 equation...3 variable
Manager
Joined: 26 Jul 2010
Posts: 102
Location: India
Concentration: Operations, General Management
Schools: IIMA (M)
GMAT 1: 640 Q48 V29
GMAT 2: 670 Q49 V31
WE: Supply Chain Management (Military & Defense)
Followers: 5

Kudos [?]: 23 [0], given: 6

Re: A contractor combined x tons of a gravel mixture that contained 10 per [#permalink]  22 Apr 2011, 22:15
word translation problems requires simplification

and we should not miss to intrept that

z=x+y in this case

then simplified equation will be 5x=3y and z=x+y

hence both staement are sufficent D
_________________

lets start again

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 7290
Followers: 384

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

Re: A contractor combined x tons of a gravel mixture that contained 10 per [#permalink]  25 Aug 2015, 21:57
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Math Expert
Joined: 02 Sep 2009
Posts: 30377
Followers: 5091

Kudos [?]: 57335 [0], given: 8811

Re: A contractor combined x tons of a gravel mixture that contained 10 per [#permalink]  25 Aug 2015, 22:44
Expert's post
A contractor combined x tons of a gravel mixture that contained 10 percent gravel G, by weight, with y tons of a mixture that contained 2 percent gravel G, by weight, to produce z tons of a mixture that was 5 percent gravel G, by weight. What is the value of x ?

Set the equation: $$0.1x+0.02y=0.05(x+y)$$, where $$x+y=z$$ --> $$5x=3y$$ --> Q: $$x=?$$

(1) $$y=10$$ --> $$5x=3y=30$$ --> $$x=6$$. Sufficient.

(2) $$z=x+y=16$$ --> $$y=16-x$$ --> $$5x=3y=3(16-x)$$ --> $$x=6$$. Sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: a-contractor-combined-x-tons-of-a-gravel-mixture-that-102681.html
_________________
Re: A contractor combined x tons of a gravel mixture that contained 10 per   [#permalink] 25 Aug 2015, 22:44
Similar topics Replies Last post
Similar
Topics:
3 A mixture of oil, water, and vinegar contains 10% oil. After all of th 1 23 Aug 2015, 11:55
A contractor combined "x" tons of a gravel mixture that 3 24 May 2011, 18:38
71 A contractor combined x tons of a gravel mixture that 20 28 Jan 2010, 14:07
2 A contractor combined x tons of gravel mixture that cotained 9 17 Oct 2007, 18:39
3 A contractor combined x tons of a gravel mixture that contai 9 09 Apr 2006, 15:49
Display posts from previous: Sort by

# A contractor combined x tons of a gravel mixture that contained 10 per

 Powered by phpBB © phpBB Group and phpBB SEO 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®.