Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

MCAT 4- Ratio of x to y?

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 15
Joined: Wed Jul 15, 2009 6:32 am
Location: Columbus
by Diep » Sun Jul 19, 2009 8:30 am
What is the ratio of x to y?
(1) 5x=2y
(2) 2x=7y-8

Man answer: Statement (1) alone is sufficient but statement (2) alone is not sufficient

My answer: Both statements together are sufficient.
Explanation: (1)--> x=y=0 or x/y = 2/5
(2) --> x=y=0 does not work

What do you guys think? Do you have seen any similar problems in materials of GMAC?
Top
Join the discussion
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 2623
Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members
Location: Montreal
Thanked: 1090 times
GMAT Score:780

by Ian Stewart » Sun Jul 19, 2009 10:07 am
Every real GMAT question that deals with ratios will be restricted to positive quantities only. So if this were a real GMAT question, it would say in advance that x and y were greater than zero. Your analysis is correct; if there is no further information in the question stem, then S1 tells us that the ratio of x to y is either 2 to 5, or it's undefined (if both x and y are zero). It's not an exception you'll encounter on the real test, however.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 171
Joined: Mon Jun 01, 2009 8:59 pm
Thanked: 8 times

by brick2009 » Sun Jul 19, 2009 11:15 am
From
1) x/y = 2/5 -> answers the question.

So ur choices have to be between A & D

This eliminates C..there is no way u can end up with C.

2.) Is not sufficient, as you can get multiple x/y values..

Hence A is the answer..


I cant figure out how u ended up with C..when A was correct to begin with.. :roll:
Top
Join the discussion
Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Thu Jul 16, 2009 8:49 am

by Jazzy3113 » Tue Jul 21, 2009 12:37 pm
I am having trouble with the second equation. Why are you unable to get a ratio? The constant of 8 should have no effect on the ratio, right?
Top
Join the discussion