BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Reservoir A contains 450 million gallons of water more than does Reservoir B. If 100 million gallons of water were...

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Moderator
Posts: 2558
Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members
by BTGmoderatorLU » Fri Apr 03, 2020 2:42 am

Timer

00:00

Answers

A

B

C

D

E

Stats

Difficulty—

Source: Princeton Review

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

The OA is C
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Legendary Member
Posts: 2214
Joined: Fri Mar 02, 2018 2:22 pmFollowed by: 5 members

Re: Reservoir A contains 450 million gallons of water more than does Reservoir B. If 100 million gallons of water were..

by deloitte247 » Sun Apr 05, 2020 8:19 am
How many million gallons of water does Reservoir A currently contain?
Solution:
A = 450 + B ------ eqn (1)
A - 100 = 2 (B + 100)
A - 100 = 2B + 200
A = 2B + 300 ------ eqn (2)
Substitute the value of A in eqn (1) with A in eqn (2)
450 + B = 2B + 300
450 - 300 = 2B - B
B = 150
Substitute the value of B in eqn (2) with the exact value of B
A = 2B + 300
A = 2(150) + 300
A = 600

Answer = Option B
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8156
Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members
Location: Los Angeles, CA
Thanked: 43 times

Re: Reservoir A contains 450 million gallons of water more than does Reservoir B. If 100 million gallons of water were..

by Scott@TargetTestPrep » Thu Apr 09, 2020 3:50 am
BTGmoderatorLU wrote: ↑
Fri Apr 03, 2020 2:42 am
 Source: Princeton Review

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

The OA is C
We can create the equations:

A = 450 + B

and

A - 100 = 2(B + 100)

A - 100 = 2B + 200

A = 2B + 300

Substituting, we have:

450 + B = 2B + 300

150 = B

So A = 450 + 150 = 600.

Answer: B

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1