Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 1308:30 AM PDT
-09:30 AM PDT
In Episode 4 of our GMAT Ninja CR series, we tackle the most intimidating CR question type: Boldface & "Legalese" questions. If you've ever stared at an answer choice that reads, "The first is a consideration introduced to counter a position that...
May 1212:00 PM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products.- May 14
08:30 AM PDT
-09:30 AM PDT
Most GMAT test-takers are intimidated by the hardest GMAT Verbal questions. In this session, Target Test Prep GMAT instructor Erika Tyler-John, a 100th percentile GMAT scorer, will show you how top scorers break down challenging Verbal questions.. - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
hwiya320
Joined: 21 Sep 2008
Last visit: 08 Feb 2012
Posts: 76
Own Kudos:
Location: Atlanta, Georgia
Concentration: Marketing, General Management, Consulting
Schools:Georgetown, UNC, Emory, GeorgiaTech
GPA: 3.5
WE 1: Product Engineering
WE 2: Logistics & Inventory
WE 3: Product Information & Pricing Manager
20 Nov 2008, 21:35
Kudos
Bookmarks
At a certain arena, with five levels, level I has 30 vacant seats, level II has 45 vacant seats, level III has 40 vacant seats, level IV has 25 vacant seats and level V has 10 vacant seats. If vacant seats are filled randomly, what is the minimum number of seats that must be filled to ensure that 3 levels are completely filled?
a 115
b 139
c 140
d 148
e 149
any good explanation?
From: Kaplan PS: Statistics and Probability, Part 2 - Challenge Question:4 of 10
a 115
b 139
c 140
d 148
e 149
any good explanation?
From: Kaplan PS: Statistics and Probability, Part 2 - Challenge Question:4 of 10
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
20 Nov 2008, 22:34
Kudos
Bookmarks
D. 148
here's how:
consider it this way, we have only 2 rows having 10, 15 seats respectively and we have to assure that one row is filled up completely.
if we have 15 people, they can seat in 8 + 7 seats
if we have 20 people, they can seat in 8+ 12 seats
if we have 22 people still they can seat in 9+ 13 seats
if we have 23 people still they can seat in 9 + 14 seats
This is the saturation point, addition of one person to this will make either row full.
so if we have 24 ppl, one row must be full
Observe that saturation point is reached when we have
(capacity of row - 1 person) in "each" row.
or (total seats - #of rows) people
&
addition of every one person gaurantees that additional one row is getting full.
here we have 30 45 40 25 10 = 150 total seats.
we have 5 rows => 150 - 5 = 145 is saturating point.
& add one person and it gaurantees that one row is full.
we have to assure that 3 rows are full.
so we have to add 3 people to saturating point
145 + 3 = 148 minimum people will be needed
here's how:
consider it this way, we have only 2 rows having 10, 15 seats respectively and we have to assure that one row is filled up completely.
if we have 15 people, they can seat in 8 + 7 seats
if we have 20 people, they can seat in 8+ 12 seats
if we have 22 people still they can seat in 9+ 13 seats
if we have 23 people still they can seat in 9 + 14 seats
This is the saturation point, addition of one person to this will make either row full.
so if we have 24 ppl, one row must be full
Observe that saturation point is reached when we have
(capacity of row - 1 person) in "each" row.
or (total seats - #of rows) people
&
addition of every one person gaurantees that additional one row is getting full.
here we have 30 45 40 25 10 = 150 total seats.
we have 5 rows => 150 - 5 = 145 is saturating point.
& add one person and it gaurantees that one row is full.
we have to assure that 3 rows are full.
so we have to add 3 people to saturating point
145 + 3 = 148 minimum people will be needed
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
