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
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
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.

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.

seminar

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 74
Joined: Fri May 11, 2012 9:06 pm
by parulmahajan89 » Mon Dec 02, 2013 1:14 pm
At a two day seminar, 90 percent of those registered attend the seminar on first day. What perecent of those registered did not attend the seminar on either day?

1)Total of 1000 people registered on two day seminar
2) Of those registered, 80 percent did not attend seminar on second day
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 768
Joined: Wed Dec 28, 2011 4:18 pmFollowed by: 140 members
Location: Berkeley, CA
Thanked: 387 times

by Mike@Magoosh » Mon Dec 02, 2013 3:46 pm
parulmahajan89 wrote:At a two day seminar, 90 percent of those registered attend the seminar on first day. What percent of those registered did not attend the seminar on either day?

1) Total of 1000 people registered on two day seminar
2) Of those registered, 80 percent did not attend seminar on second day
Dear parulmahajan89,
I'm happy to help with this. :-)

See this blog for info about ratios & proportions:
https://magoosh.com/gmat/2013/gmat-quant ... oportions/
Here's some information about percents:
https://magoosh.com/gmat/2013/gmat-quant ... -percents/

The short answer is: nothing is sufficient here.

The number of people is irrelevant --- all the other information is in percents, and we are asked a prompt question about percent, so the number of the people is completely irrelevant to the calculation.

With all combined information, we know
First day --- 90% attended, so 10% didn't
Second day --- 80% didn't attend, so 20% did.

It could be that the 10% that didn't attend the first day was part of the 80% that didn't attend the second day, so this 10% didn't attend either day.
OR, it could be that everyone in that 10% that didn't attend the first day felt guilty, and were part of the 20% that attended the second day, so that everyone attended at least one day.

Even given all the information, we cannot determine anything definitively. Altogether, everything is still insufficient. Answer = (E).

Does all this make sense?
Mike :-)
Magoosh GMAT Instructor
https://gmat.magoosh.com/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 74
Joined: Fri May 11, 2012 9:06 pm

by parulmahajan89 » Tue Dec 03, 2013 10:52 am
Hi Mike,
So total number of 1000 people is irrelevant here?

Thank you
Parul
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 768
Joined: Wed Dec 28, 2011 4:18 pmFollowed by: 140 members
Location: Berkeley, CA
Thanked: 387 times

by Mike@Magoosh » Tue Dec 03, 2013 2:11 pm
parulmahajan89 wrote:Hi Mike,
So total number of 1000 people is irrelevant here?

Thank you
Parul
Dear Parul,
Yes, this is a tricky thing about ratio/percent problems. We can solve a percent or ratio problem just with information about percents or ratios, without knowing any of the numerical values. If we have two numerical values, we can use that to calculate one of the percents or ratios, and that would add to what we know. BUT, if we have only one numerical value, we can use that, by itself, to calculate any new percents or ratios, so it doesn't add anything to the problem.
Does this make sense?
Mike :-)
Magoosh GMAT Instructor
https://gmat.magoosh.com/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1