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 500,000 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:

Each cell of type X divides into a certain number of X-cells [#permalink]

Show Tags

12 Jun 2011, 19:30

1

This post received KUDOS

6

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

45% (medium)

Question Stats:

57% (04:16) correct
43% (02:10) wrong based on 51 sessions

HideShow timer Statictics

Each cell of type X divides into a certain number of X-cells every hour. Each Type Y cell also divides into a constant number of Y-cells every hour, but not necessarily at the same rate as X. At a certain time, container A contained 10,000 X-cells and container B contained 10,000 Y-cells. After one hour, there were 30,000 more X-cells in container A than Y-cells in container B. After another hour, there were 330,000 more X-cells than Y-cells. What is the division rate per hour for the X-cells?

Each cell of type X divides into a certain number of X-cells every hour. Each Type Y cell also divides into a constant number of Y-cells every hour, but not necessarily at the same rate as X. At a certain time, container A contained 10,000 X-cells and container B contained 10,000 Y-cells. After one hour, there were 30,000 more X-cells in container A than Y-cells in container B. After another hour, there were 330,000 more X-cells than Y-cells. What is the division rate per hour for the X-cells?

(A) 4 (B) 5 (C) 6 (D) 7 (E) 8

I will provide OA after some discussion.

X^2- (X-3)^2 =33 X^2-X^2+6X-9 = 33 6X=42 X= 7 Y =3 Its D

Last edited by sudhir18n on 13 Jun 2011, 00:10, edited 1 time in total.

Division rate of X-cell = x cells/hour Division rate of Y-cell = y cells/hour.

Starting quantity for X-cells in container A=10,000 Starting quantity for Y-cells in container B=10,000

After one hour, quantity of X-cells in container A=10,000x After one hour, quantity of Y-cells in container B=10,000y 10,000x-10,000y=30,000 x-y=3 ----------(1)

Also, after another hour, quantity of X-cells in container A=(10,000x)x after another hour, quantity of Y-cells in container B=(10,000y)y

I plugged in numbers and I get C as the answer. Now: X = 10000 Y = 10000

After 1 hour, if constant growth rate of x = 6, then # x-cells in 1 hour = 10000 + (10000 * 6) = 70000 this is 30000 more than y cells after 1 hour, Therefore Y cells after 1 hour should be 40000 40000 Y cells = 10000 (original Y cells) + growth of 30000 that means Y growth multiple is 3 per hour

now after 1 more hour: X grows to 70000 + 70000*6 = 490000 Y is 330000 less than X after 2 hours so Y cells = 160000 160000 y cells = 40000 + 40000 * 3

Each cell of Type X divides into a certain number of X-cells [#permalink]

Show Tags

09 Jun 2014, 06:14

Each cell of Type X divides into a certain number of X-cells every hour. Each Type Y cell also divides into a constant number of Y-cells every hour, but not necessarily at the same rate as X. At a certain time, container A contained 10,000 X-cells and container B contained 10,000 Y-cells. After one hour, there were 30,000 more X-cells in container A than Y-cells in container B. After another hour, there were 330,000 more X-cells than Y-cells. What is the division rate per hour for the X-cells?

Re: Each cell of Type X divides into a certain number of X-cells [#permalink]

Show Tags

09 Jun 2014, 09:04

3

This post received KUDOS

Expert's post

goodyear2013 wrote:

Each cell of Type X divides into a certain number of X-cells every hour. Each Type Y cell also divides into a constant number of Y-cells every hour, but not necessarily at the same rate as X. At a certain time, container A contained 10,000 X-cells and container B contained 10,000 Y-cells. After one hour, there were 30,000 more X-cells in container A than Y-cells in container B. After another hour, there were 330,000 more X-cells than Y-cells. What is the division rate per hour for the X-cells?

A. 4 B. 5 C. 6 D. 7 E. 8

Let the division rate per hour for the X-cells be x and the division rate per hour for the Y-cells be y.

Initially: X-cells = 10,000 and y-cells = 10,000.

After 1 hour: X-cells = \(10,000x\) and y-cells = \(10,000y\). \(10,000x - 10,000y = 30,000\) --> \(x - y = 3\).

Re: Each cell of type X divides into a certain number of X-cells [#permalink]

Show Tags

12 Jul 2014, 15:41

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: Each cell of type X divides into a certain number of X-cells [#permalink]

Show Tags

24 Nov 2015, 19:25

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. _________________

So, my final tally is in. I applied to three b schools in total this season: INSEAD – admitted MIT Sloan – admitted Wharton – waitlisted and dinged No...

A few weeks ago, the following tweet popped up in my timeline. thanks @Uber_Mumbai for showing me what #daylightrobbery means!I know I have a choice not to use it...

“This elective will be most relevant to learn innovative methodologies in digital marketing in a place which is the origin for major marketing companies.” This was the crux...