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

Redeem

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.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 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
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
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
GMATOnDemand Start 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 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Ratios

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 190
Joined: Thu Jan 14, 2010 8:29 pm
Thanked: 2 times
by phoenix9801 » Sat Jun 02, 2012 4:51 pm
The ratio of professors to administrators is 3 to 4. If the number of professors increased by 5 and the number of administrators also increased by 5, what is the ratio of these two new quantities?

A) 23/24
B) 18/19
C) 8/9
D) 3/4
E) It cannot be determined from the information given



Initially, the nurses and doctors in a room were in the ratio of 5:7. Six doctors leave the room. If there are 35 nurses in the room, how many doctors are left in the room?

A) 49
B) 43
C) 30
D) 25
E) 19
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 342
Joined: Wed Jul 08, 2009 8:50 amFollowed by: 19 members
Thanked: 214 times
GMAT Score:740

by Birottam Dutta » Sat Jun 02, 2012 6:46 pm
1.
Let number of professors be 3x and number of administrators be 4x. (This gives the ratio of 3:4 which is as per the question).

Now, profs increase by 5 => profs=3x+5.
Admins increase by 5=> admins=4x+5.

New ratio = (3x+5)/(4x+5). This does not give a firm ratio because of the presence of the additive terms in both numerator and denominator. So, ratio cannot be determined.

Answer E!


2.
Let nurses be 5x and doctors be 7x.
It is given that number of nurses = 35=> 5x=35. This gives x=7.
So, number of doctors =7x=7*7=49.
When 6 doctors leave the room, number of doctors remaining = 49-6=43.

Hence, answer is B!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Sat Jun 02, 2012 6:53 pm
phoenix9801 wrote:The ratio of professors to administrators is 3 to 4. If the number of professors increased by 5 and the number of administrators also increased by 5, what is the ratio of these two new quantities?

A) 23/24
B) 18/19
C) 8/9
D) 3/4
E) It cannot be determined from the information given
Case 1: 3 professors, 4 administrators
When each value is increased by 5, the new ratio = (3+5)/(4+5) = 8/9.

Case 2: 6 professors, 8 administrators
When each value is increased by 5, the new ratio = (6+5)/(8+5) = 11/13.

Since different new ratios are possible, the value of the new ratio cannot be determined.

The correct answer is E.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Sat Jun 02, 2012 7:04 pm
phoenix9801 wrote: Initially, the nurses and doctors in a room were in the ratio of 5:7. Six doctors leave the room. If there are 35 nurses in the room, how many doctors are left in the room?

A) 49
B) 43
C) 30
D) 25
E) 19
In the RATIO, the nurses are represented by 5.
The ACTUAL number of nurses = 35.
Thus, the MULTIPLIER here = 35/5 = 7.
Multiplying both values in the ratio by 7, we get:
N : D = 5:7 = 35:49.
Thus, after 6 doctors leave, the number of doctors left = 49-6 = 43.

The correct answer is B.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1