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

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
20 Jun 2008, 01:38

1

This post received KUDOS

quantum wrote:

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show? (1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. (2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

Hope you like that one!

1 not suff, because you have info. only about the front 20 rows, the back 5 rows, you dont know whether it is occupied?

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
20 Jun 2008, 01:49

Yes C cannot be the case - mathematically: Let 0-10 be o1 and v1 for occupied & Vacant respectively similary for 10-20 o2 & v2 and the 20-25 as o3 & v3

From Q stem: o1+v1=270, o2+v2=270 & o3+v3=135 Target: To find o1+o2+o3

Now frm st 1: v1+v2=200 -------insuffi

St2: v2+v3=300 ---Insuffi

St1+2: We end up with eqs: o1+o2=270 & o2+o3=105 ---- no way can we find the target hence E.

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
20 Jun 2008, 02:03

quantum wrote:

But can someone explain in details why C is wrong?

Oh, just think that you can figure out!

C is combine 1 and 2. You see the intersection between group1(statement1) and group2(statement2) has NOT-fixed number of seats unoccupied. You can be sure only that the number of rows in the intersection is 5 rows, but statement1 say average per row is 10 unoccupied and statement2 says everage per row is 20 unoccupied. So the total number of seats unoccupied in 5 rows in the intersection can be 50 or 100 seats.

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
20 Jun 2008, 13:02

7

This post received KUDOS

1

This post was BOOKMARKED

quantum wrote:

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show? (1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. (2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

Hope you like that one!

E

Attachments

theater.gif [ 9.82 KiB | Viewed 6106 times ]

_________________

Factorials were someone's attempt to make math look exciting!!!

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
21 Jun 2008, 01:17

quantum wrote:

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show? (1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. (2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

Hope you like that one!

Stem :- Total number is seats = 25 * 27 = 675 To find :- No of seats occupied 'x'.

Option1 ) Avg of 10 unoccupied seats in the front row Number of seats unocupied in the front 20 rows = 200 seats. Total number of occupied seats = 675 -200 = 475 . SUFF

Option 2 ) Avg of 10 unoccupied seats in the back 15 rows:- 20 Total number of seats unoccupied = 20 *15 = 300 Total number of occupied seats = 675 -300 = 375 . SUFF

Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
08 Jan 2010, 13:23

1

This post was BOOKMARKED

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show?

(1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. (2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

Re: Theater M has 25 rows with 27 seats in each row. [#permalink]
26 Apr 2013, 21:53

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show?

(1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. Clearly not sufficient, no info about other rows

(2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows. Clearly not sufficient, no info about other rows

1+2)With 1 we know that there are 200 unoccupied in the first 20 rows, with 2 we know that there are 300 unoccupied in the last 15 rows. Because we don't know how many seats there are in the common part (rows 10-20) both statements are still not sufficient. E

Hope it's clear, let me know _________________

It is beyond a doubt that all our knowledge that begins with experience.

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
11 Oct 2013, 05:32

sagarsabnis wrote:

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show?

(1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows. (2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

Statement 1 - Clearly insfficient, we only have information about 20 rows Statement 2- Same here, we are missing information on other rows

Now both (1) and (2) together - So we have from the 1st statement that the total number of seats for the first 20 rows that were unnocupied totaled 200. And also the unnocpied for the back 15 rows were 300. But we have an overlap here between rows. If we don't have more information it will be impossible to know. Imagine a venn diagram and visualize the intersection between both. As long as you don't have the exact value for the intersection it will be impossible to know the total number of unnocupied seats and hence know what the occupied seats are.

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
22 Nov 2014, 21:50

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
17 Jan 2015, 12:09

1

This post received KUDOS

E

Try seeing extremes.... statements didnt concretize the seating pattern so

divide rows into 3 parts first 10 + 10 + 5 rows

extreme 1: Middle set takes average of say 30 (higher side)

first 10 has average of <10 unoccupied (say 5..u can calculate actual possibility) + next 10 say abt 30 + last 5 has average of <20 unoccupied => would have a overall count on lower side

extreme 2: Middle set takes average of say 5

first 10 has average of >10 unoccupied (say 20..u can calculate actual possibility) + next 10 say abt 5 + last 5 has average of >20 unoccupied => would have a overall count on higher side

The logic is the middle set can act as cushion so we have a range of possibilities

Had their been no overlap....then we can find the total

Re: Theater M has 25 rows with 27 seats in each row. How many of [#permalink]
17 Jan 2015, 12:09

2

This post received KUDOS

E

Try seeing extremes.... statements didnt concretize the seating pattern so

divide rows into 3 parts first 10 + 10 + 5 rows

extreme 1: Middle set takes average of say 30 (higher side)

first 10 has average of <10 unoccupied (say 5..u can calculate actual possibility) + next 10 say abt 30 + last 5 has average of <20 unoccupied => would have a overall count on lower side

extreme 2: Middle set takes average of say 5

first 10 has average of >10 unoccupied (say 20..u can calculate actual possibility) + next 10 say abt 5 + last 5 has average of >20 unoccupied => would have a overall count on higher side

The logic is the middle set can act as cushion so we have a range of possibilities

Had their been no overlap....then we can find the total

Hope it helps..!

gmatclubot

Re: Theater M has 25 rows with 27 seats in each row. How many of
[#permalink]
17 Jan 2015, 12:09

I´ve done an interview at Accepted.com quite a while ago and if any of you are interested, here is the link . I´m through my preparation of my second...

It’s here. Internship season. The key is on searching and applying for the jobs that you feel confident working on, not doing something out of pressure. Rotman has...