GMAT Changed on April 16th - Read about the latest changes here

It is currently 25 Apr 2018, 01:47

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Director
Director
User avatar
P
Status: It's near - I can see.
Joined: 13 Apr 2013
Posts: 757
Location: India
Concentration: International Business, Operations
GMAT 1: 480 Q38 V22
GPA: 3.01
WE: Engineering (Consulting)
Premium Member Reviews Badge
Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]

Show Tags

New post 29 Dec 2017, 09:25
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

42% (43:29) correct 58% (01:35) wrong based on 53 sessions

HideShow timer Statistics

Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 30 ounces of a mixture consists of x ounces of Chemical X and y ounces of Chemical Y, does the cost of Chemical X in the mixture exceed that of Chemical Y ?

1. The cost of the 30 ounce mixture is less than $160.
2. y < 15
[Reveal] Spoiler: OA

_________________

"Success is not as glamorous as people tell you. It's a lot of hours spent in the darkness."

Manager
Manager
User avatar
S
Joined: 23 May 2017
Posts: 219
Concentration: Finance, Accounting
WE: Programming (Energy and Utilities)
CAT Tests
Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]

Show Tags

New post 29 Dec 2017, 09:58
Chemical X costs $4 per ounce,
Chemical Y costs $8 per ounce.

Given x + y = 30

so cost of the mixture : 4x + 8y = 4x + 8(30-x) = 240 - 4x

statement 1: cost of the mixture is less than 160

240 - 4x < 160 or 4x > 80 or x>20
let's say x = 21 and y = 9

cost of x in the mixture = 21 * 4 = $82
cost of y in the mixture = 9 * 8 = $72

hence : cost of x in the mixture is greater than that of y in the mixture: A
_________________

If you like the post, please award me Kudos!! It motivates me

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 44654
Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]

Show Tags

New post 29 Dec 2017, 10:42
QZ wrote:
Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 30 ounces of a mixture consists of x ounces of Chemical X and y ounces of Chemical Y, does the cost of Chemical X in the mixture exceed that of Chemical Y ?

1. The cost of the 30 ounce mixture is less than $160.
2. y < 15


This is a "stolen" OG question: https://gmatclub.com/forum/material-a-c ... 82349.html
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Director
Director
User avatar
P
Status: It's near - I can see.
Joined: 13 Apr 2013
Posts: 757
Location: India
Concentration: International Business, Operations
GMAT 1: 480 Q38 V22
GPA: 3.01
WE: Engineering (Consulting)
Premium Member Reviews Badge
Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]

Show Tags

New post 29 Dec 2017, 10:53
But certainly I didn't stole it. Found it in my practice material.

Sent from my SM-G615F using GMAT Club Forum mobile app
_________________

"Success is not as glamorous as people tell you. It's a lot of hours spent in the darkness."

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 44654
Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]

Show Tags

New post 29 Dec 2017, 10:57
Expert's post
1
This post was
BOOKMARKED
QZ wrote:
But certainly I didn't stole it. Found it in my practice material.

Sent from my SM-G615F using GMAT Club Forum mobile app


Sure. Some prep companies just change numbers in official questions and publish them as their own. In such cases it's much better to practice official ones than copies.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Manager
Manager
User avatar
G
Joined: 16 Sep 2016
Posts: 211
WE: Analyst (Health Care)
Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3 [#permalink]

Show Tags

New post 29 Dec 2017, 11:09
A : 4x + 8y < 160
x + 2y < 40 (dividing by 4)
Also we have,
x + y = 30
Therefore,
y < 40 -30 < 10
If y < 10 , then cost of chemical Y is < 8*10 < 80.

Since x + y = 30, y < 10 -> x > 20.

Therefore cost of material X is
> 4*20 > 80

Hence (1) is sufficient.

(2) is not. So answer is A.

Sent from my BND-AL10 using GMAT Club Forum mobile app
Re: Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3   [#permalink] 29 Dec 2017, 11:09
Display posts from previous: Sort by

Chemical X costs $4 per ounce, and Chemical Y costs $8 per ounce. If 3

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.