GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Nov 2018, 08:18

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 in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     November 17, 2018

     November 17, 2018

     07:00 AM PST

     09:00 AM PST

    Nov. 17, 7 AM PST. Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • GMATbuster's Weekly GMAT Quant Quiz # 9

     November 17, 2018

     November 17, 2018

     09:00 AM PST

     11:00 AM PST

    Join the Quiz Saturday November 17th, 9 AM PST. The Quiz will last approximately 2 hours. Make sure you are on time or you will be at a disadvantage.

By weight, liquid A makes up 8 percent of solution R and 18 percent of

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

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50619
By weight, liquid A makes up 8 percent of solution R and 18 percent of  [#permalink]

Show Tags

New post 15 Jul 2018, 07:39
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

85% (01:24) correct 15% (03:41) wrong based on 98 sessions

HideShow timer Statistics

By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of solution S, then liquid A accounts for what percent of the weight of the resulting solution?

A. 10%
B. 13%
C. 15%
D. 19%
E. 26%

_________________

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

VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1113
By weight, liquid A makes up 8 percent of solution R and 18 percent of  [#permalink]

Show Tags

New post 15 Jul 2018, 08:08
5 of liquid A in final solution
Bunuel wrote:
By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of solution S, then liquid A accounts for what percent of the weight of the resulting solution?

A. 10%
B. 13%
C. 15%
D. 19%
E. 26%


let x=% of liquid A in final solution
.08*3+.18*7=10x
x=.15=15%
C
VP
VP
User avatar
V
Status: It's near - I can see.
Joined: 13 Apr 2013
Posts: 1285
Location: India
Concentration: International Business, Operations
GMAT 1: 480 Q38 V22
GPA: 3.01
WE: Engineering (Consulting)
Premium Member Reviews Badge CAT Tests
Re: By weight, liquid A makes up 8 percent of solution R and 18 percent of  [#permalink]

Show Tags

New post 19 Jul 2018, 06:22
Bunuel wrote:
By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of solution S, then liquid A accounts for what percent of the weight of the resulting solution?

A. 10%
B. 13%
C. 15%
D. 19%
E. 26%


Weighted Avg. method :

Let us say liquid A accounts for x% weight of the final solution

\(\frac{3}{7} = \frac{18 - x}{x - 8}\)

\(10x = 150\)

\(x = 15%\)

(C)
_________________

"Do not watch clock; Do what it does. KEEP GOING."

Manager
Manager
avatar
G
Joined: 28 Jun 2018
Posts: 146
Location: India
Concentration: Finance, Marketing
GMAT 1: 650 Q49 V30
GPA: 4
GMAT ToolKit User Premium Member Reviews Badge CAT Tests
Re: By weight, liquid A makes up 8 percent of solution R and 18 percent of  [#permalink]

Show Tags

New post 19 Jul 2018, 06:29
1
total solution = 3+7 =10
total weight of A = 3*8% + 7* 18% = 1.5
% of solution A = 1.5/10 *100 = 15%
_________________

What to do if you are new to GMAT:
https://gmatclub.com/forum/what-to-do-if-you-are-new-272708.html#p2108758

GMAC official guides : https://gmatclub.com/forum/gmac-official-guides-the-master-directory-links-240610.html#p1854935

Give me kudos if you like it , it's totally harmless :)

Intern
Intern
avatar
Joined: 16 Nov 2013
Posts: 2
By weight, liquid A makes up 8 percent of solution R and 18 percent of  [#permalink]

Show Tags

New post 19 Jul 2018, 07:25
\(\frac{(3×8 + 7×18)}{(3 + 7)}\) = \(\frac{150}{10}\) = 15 (C)
Intern
Intern
User avatar
B
Status: No Progress without Struggle
Joined: 04 Aug 2017
Posts: 43
Location: Armenia
GPA: 3.4
Re: By weight, liquid A makes up 8 percent of solution R and 18 percent of  [#permalink]

Show Tags

New post 29 Jul 2018, 06:31
Since the question asks for the weight of the Liquid A, we should find the availability of Liquid A in the mixture. Logically the percentage does not change even when the gram raises.
8% of Liquid A in the 3 gram of R = 0.08*3=0.24
18% of Liquid A in the 7 gram of S = 0.18*7=1.62
Now we should turn this into part/total form.
1.5/10*100=15%
_________________

Seryozha Sargsyan 21

Contact: sargsyanseryozha@gmail.com

What you think, you become,
What you feel, you attract,
What you imagine, you create.

GMAT Club Bot
Re: By weight, liquid A makes up 8 percent of solution R and 18 percent of &nbs [#permalink] 29 Jul 2018, 06:31
Display posts from previous: Sort by

By weight, liquid A makes up 8 percent of solution R and 18 percent of

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| 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®.