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 →

Rate question

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Senior | Next Rank: 100 Posts
Posts: 47
Joined: Wed Nov 24, 2010 12:57 am
Thanked: 3 times
by Cheese12 » Sat Sep 24, 2011 1:25 am
Two water tanks, X and Y, were drained simultaneoulsy. If X contained 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to become empty?

1) For every gallon drained from tank Y, 2 gallons were drained from tank X.
2) Tank Y was drained at a constant rate of 20 gallons per hr.


Answer : C
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Legendary Member
Posts: 966
Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members
Thanked: 230 times

by shankar.ashwin » Sat Sep 24, 2011 2:01 am
Rate at which tank drains = Amount of water drained / time taken

1) Volume of 2 tanks are 'Y' and 'Y+30' and rates are Ry (=2Rx) and Rx repectively.
Cant solve using this (2 unknows)

2) Given Rate of Ry , (alone we dont know Rx)

Together; We know Ry = Rx/2 = 20.

Hence we can solve for time Hence C

If interested in answer;

Y/20 = Y+30/40(Tank X)
Y = 30

Time = 1.5hrs

Cheese12 wrote:Two water tanks, X and Y, were drained simultaneoulsy. If X contained 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to become empty?

1) For every gallon drained from tank Y, 2 gallons were drained from tank X.
2) Tank Y was drained at a constant rate of 20 gallons per hr.


Answer : C
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 31
Joined: Sun Aug 21, 2011 7:12 pm
Thanked: 1 times

by bijoyajj » Sat Sep 24, 2011 2:30 am
Cheese12 wrote:Two water tanks, X and Y, were drained simultaneoulsy. If X contained 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to become empty?

1) For every gallon drained from tank Y, 2 gallons were drained from tank X.
2) Tank Y was drained at a constant rate of 20 gallons per hr.


Answer : C
Rate = Q/t, Given info's Quantities relationships and time

since time equal, (Y+30)/Rx = Y/Ry .. So in order to solve we need rate ratios or quantity in any one tank..

(2) rate ratio or quantity missin.. Insufficient
(1) we have rate ratio, hence can solve for y .. but still we dont know the exact value for rate.. so insufficient

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