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.

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:

Enter The Economist GMAT Tutor’s Brightest Minds competition – it’s completely free! All you have to do is take our online GMAT simulation test and put your mind to the test. Are you ready? This competition closes on December 13th.

Attend a Veritas Prep GMAT Class for Free. With free trial classes you can work with a 99th percentile expert free of charge. Learn valuable strategies and find your new favorite instructor; click for a list of upcoming dates and teachers.

Does GMAT RC seem like an uphill battle? e-GMAT is conducting a free webinar to help you learn reading strategies that can enable you to solve 700+ level RC questions with at least 90% accuracy in less than 10 days.

City X has a population 4 times as great as the population of City Y,
[#permalink]

Show Tags

14 Jun 2016, 14:48

3

18

00:00

A

B

C

D

E

Difficulty:

5% (low)

Question Stats:

75% (00:51) correct 25% (00:54) wrong based on 1474 sessions

HideShow timer Statistics

City X has a population 4 times as great as the population of City Y, which has a population twice as great as the population of City Z. What is the ratio of the population of City X to the population of City Z?

Re: City X has a population 4 times as great as the population of City Y,
[#permalink]

Show Tags

14 Jun 2016, 15:05

2

Top Contributor

2

AbdurRakib wrote:

City X has a population 4 times as great as the population of City Y, which has a population twice as great as the population of City Z. What is the ratio of the population of City X to the population of City Z?

A nice (fast) approach is to plug in some numbers that meet the given conditions.

City Y has a population twice as great as the population of City Z Let's say the population of City Z is 1 person This means the population of City Y is 2 people

City X has a population 4 times as great as the population of City Y If the population of City Y is 2 people, then the population of City X is 8 people

So, the ratio of the population of City X to the population of City Z = 8 to 1

Re: City X has a population 4 times as great as the population of City Y,
[#permalink]

Show Tags

02 Dec 2016, 06:50

1

AbdurRakib wrote:

City X has a population 4 times as great as the population of City Y, which has a population twice as great as the population of City Z. What is the ratio of the population of City X to the population of City Z?

A) 1:8 B) 1:4 C) 2:1 D) 4:1 E) 8:1

We are given that City X has a population 4 times as great as the population of City Y and that City Y has a population twice as great as the population of City Z.

If we let the population of City X = x, the population of city Y = y, and the population of city Z = z, we can create the following equations:

x = 4y

AND

y = 2z

We need to determine the ratio of the population of City X to the population of City Z, or x/z.

To determine the ratio, we can get both x and z in terms of y, so we have:

x = 4y and z = y/2.

We can substitute 4y for x and y/2 for z in the ratio x/z:

Re: City X has a population 4 times as great as the population of City Y,
[#permalink]

Show Tags

24 Mar 2018, 08:25

1

AbdurRakib wrote:

City X has a population 4 times as great as the population of City Y, which has a population twice as great as the population of City Z. What is the ratio of the population of City X to the population of City Z?

Re: City X has a population 4 times as great as the population of City Y,
[#permalink]

Show Tags

31 Mar 2019, 00:23

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.
_________________