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

The population of City A for each of three years...

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Moderator
Posts: 2650
Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members
by BTGmoderatorLU » Sun Jan 14, 2018 7:03 am
Image

zoom here, https://postimg.cc/image/cbexbhn91/

The population of City A for each of three years is shown in the table above. If the population grew by m percent from 1970 to 1980 and n percent from 1980 to 1990, then m exceeds n by how much?

A. 37.5
B. 20
C. 17.5
D. 15
E. 12.5

The OA is C.

I'm confused with this PS question. Experts, any suggestion? I need to determine the value of n and m from the table but I'm not sure how can I do it. Thanks in advance.
Top
Join the discussion
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
Elite Legendary Member
Posts: 10391
Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members
Location: Palo Alto, CA
Thanked: 2867 times
GMAT Score:800

by [email protected] » Sun Jan 14, 2018 11:03 am
Hi LUANDATO,

We're told that the population grew by M percent from 1970 to 1980 (40,000 to 55,000) and N percent from 1980 to 1990 (55,000 to 66,000). We're asked for how much M exceeds N. This question is essentially about using the Percentage Change Formula.

Percent Change = (New - Old)/Old

From 1970 to 1980.... (55,000 - 40,000)/(40,000) = 15,000/40,000 = 15/40 = 37.5/100
M = 37.5

From 1980 to 1990.... (66,000 - 55,000)/(55,000) = 11,000/55,000 = 1/5 = 20/100
N = 20

M exceeds N = 37.5 - 20 = 17.5

Final Answer: C

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Top
Join the discussion

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8246
Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members
Location: Los Angeles, CA
Thanked: 43 times

by Scott@TargetTestPrep » Mon Aug 05, 2019 4:12 pm
BTGmoderatorLU wrote:Image

zoom here, https://postimg.cc/image/cbexbhn91/

The population of City A for each of three years is shown in the table above. If the population grew by m percent from 1970 to 1980 and n percent from 1980 to 1990, then m exceeds n by how much?

A. 37.5
B. 20
C. 17.5
D. 15
E. 12.5

The OA is C.
The percent increase from 1970 to 1980 is:

(55,000 - 40,000)/40,000 x 100

15,000/40,000 x 100

15/40 x 100

37.5

So m = 37.5 percent

Likewise, the percent increase from 1980 to 1990 is:

(66,000 - 55,000)/55,000 x 100

11,000/55,000 x 100

11/55 x 100

20

So n = 20 percent.

Therefore, m - n = 17.5 percent.

Answer: C

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