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

It is currently 12 Nov 2018, 21:30

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
  • Essential GMAT Time-Management Hacks

     November 14, 2018

     November 14, 2018

     07:00 PM PST

     08:00 PM PST

    Join the webinar and learn time-management tactics that will guarantee you answer all questions, in all sections, on time. Save your spot today! Nov. 14th at 7 PM PST
  • $450 Tuition Credit & Official CAT Packs FREE

     November 15, 2018

     November 15, 2018

     10:00 PM MST

     11:00 PM MST

    EMPOWERgmat is giving away the complete Official GMAT Exam Pack collection worth $100 with the 3 Month Pack ($299)

Reservoir A contains 450 million gallons of water more than does Reser

  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: 50544
Reservoir A contains 450 million gallons of water more than does Reser  [#permalink]

Show Tags

New post 31 Oct 2018, 01:23
1
1
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

67% (00:55) correct 33% (01:40) wrong based on 33 sessions

HideShow timer Statistics

Reservoir A contains 450 million gallons of water more than does Reservoir B. If 100 million gallons of water were to be drained from Reservoir A into Reservoir B, then Reservoir A would contain twice as much water as would Reservoir B. How many million gallons of water does Reservoir A currently contain?

A. 500
B. 600
C. 700
D. 800
E. 900

_________________

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
S
Joined: 09 Jun 2018
Posts: 101
Location: United States (IN)
GPA: 3.95
WE: Engineering (Transportation)
GMAT ToolKit User Premium Member CAT Tests
Re: Reservoir A contains 450 million gallons of water more than does Reser  [#permalink]

Show Tags

New post 31 Oct 2018, 05:06
2
Let A and B be capacity of each reservoir.

A = B + 450 ................. (1)
A-100 = 2*(B+100) .................. (2)

(2) becomes A = 2B + 300

Solving, we get B = 150, A = 600.

Option B
_________________

If you found this relevant and useful, please Smash that Kudos button!

Intern
Intern
avatar
B
Joined: 15 Oct 2018
Posts: 1
GMAT ToolKit User
Re: Reservoir A contains 450 million gallons of water more than does Reser  [#permalink]

Show Tags

New post 09 Nov 2018, 03:59
1
I have got B too.
Why OA is A???
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50544
Re: Reservoir A contains 450 million gallons of water more than does Reser  [#permalink]

Show Tags

New post 09 Nov 2018, 04:03
Senior Manager
Senior Manager
avatar
G
Joined: 19 Oct 2013
Posts: 469
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
GMAT ToolKit User CAT Tests
Re: Reservoir A contains 450 million gallons of water more than does Reser  [#permalink]

Show Tags

New post 09 Nov 2018, 04:12
Bunuel wrote:
Reservoir A contains 450 million gallons of water more than does Reservoir B. If 100 million gallons of water were to be drained from Reservoir A into Reservoir B, then Reservoir A would contain twice as much water as would Reservoir B. How many million gallons of water does Reservoir A currently contain?

A. 500
B. 600
C. 700
D. 800
E. 900


A = 450 + B

A - 100 = 2 (B+100)

450 + B - 100 = 2B + 200

350 + B = 2B + 200

B = 150

A = 600

To confirm this

600 - 100 = 500

2 (150+100) = 2 * 250 = 500

Answer choice B

Posted from my mobile device
GMAT Club Bot
Re: Reservoir A contains 450 million gallons of water more than does Reser &nbs [#permalink] 09 Nov 2018, 04:12
Display posts from previous: Sort by

Reservoir A contains 450 million gallons of water more than does Reser

  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®.