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
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.

Venn Diagram

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 7
Joined: Mon Feb 08, 2010 4:28 pm
by elgrower » Tue Mar 02, 2010 11:29 am
Can someone please help me solve this question:

Of 20 Adults, 5 belong to X, 7 belong to Y, and 9 belong to Z. If 2 belong to all three organizations and 3 belong to exactly 2 organizations, how many belong to none of these organizations?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 45
Joined: Tue Mar 02, 2010 4:27 am
Thanked: 2 times

by yeahdisk » Tue Mar 02, 2010 12:14 pm
Draw a venn diagram - 3 overlapping circles.

"2 belong to all 3 organizations" - so put a 2 in the intersect of all 3 of your circles.

"3 belong to exactly 2 organisations" - so stick a 3 in any* of the intersects between 2 of your circles.

Then, work out the remainder you need to put in each of the single sets to make the total add up to 5 for X, 7 for Y, and 9 for Z.

The answer to the question is 6 - all of your numbers in your diagram should add up to 14, subtract this from 20






*I thought this would need to be better defined but I tries out a few variations and they all came to the same answer
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 7
Joined: Mon Feb 08, 2010 4:28 pm

by elgrower » Tue Mar 02, 2010 12:57 pm
I get the first step, put 2 in the middle. I am confused from there. Put a "3" in "any of the circles", How do I determine "the remainder"?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 194
Joined: Thu Jan 14, 2010 5:18 am
Thanked: 2 times

by girish3131 » Fri Mar 12, 2010 3:27 am
20 = 5 +7+9 -3 +2 + A

A = 0


Acc to me ... there is nobody who dont belong to any organization.... ie everybody belongs to atleast one org...

wats OA...



TA
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 7
Joined: Mon Feb 08, 2010 4:28 pm

by elgrower » Fri Mar 12, 2010 6:53 am
Thanks for that response. Although you are wrong, you showed me how to complete the problem.

5+7+9 = 21

21-3-2(2)=14

6 people is the answer.

You added 2 rather than multiply and then subtract.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1