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 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

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

lawyers

Expert replies
by gmattaker33 » Mon Mar 23, 2009 4:54 am
28 lawyers from 3 firms X, Y, Z. They can either belong to only 1 firm or belong to the three firms at the same time. X firm has 10 lawyers, Y has 11 lawyers and Z has 13 lawyers. How many people only belong to Z?

Solution: 10

10+11+13-2n=28 ----〉why 2n and not only n??

N=3

13-n=10
Join the discussion
Source: — Problem Solving |

Re: lawyers

by 2ndShot » Mon Mar 23, 2009 5:10 am
gmattaker33 wrote: 10+11+13-2n=28 ----〉why 2n and not only n??
Because

n=number of lawyers belonging to all three firms at the same time
10-n=lawyers only in X
11-n=lawyers only in Y
13-n=lawyers only in Z

Therefore the total number of lawyers is

(10-n)+(11-n)+(13-n)+n = 10+11+13-3n+n = 10+11+13-2n =28
Join the discussion