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 GRE 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:
Your score will improve and your results will be more realistic
Is there something wrong with our timer?Let us know!
You’ll LOVE this deal – 20% off J-Term Application Packages! (Valid through 17 March 2024). Upon initial inquiry (phone or online), reference GMAT Club code GMATClub20, and the discount will automatically be applied.
Join Manhattan Prep instructor Ryan Starr as he explain the key differences among the exams and how business schools view each test—and help you determine which one may be best for you.
Get the inside scoop on what makes Emory’s Goizueta Business School great and how you can present a strong MBA application. Explore the difference between our One-Year MBA and Two-Year MBA programs, talk to our admissions team, and meet students.
QOTD#25 If the value of the expression above is to be double
[#permalink]
13 Nov 2016, 08:30
5
sandy wrote:
\(\frac{u}{v} * \frac{x}{(y+z)}\)
If the value of the expression above is to be doubled by halving exactly one of the five variables, which variable should be halved?
A. u B. v C. x D. y E. z
Combine the two fractions to get ux/(v)(y+z) First notice that, if we make the numerator smaller, the value of the entire fraction will become smaller. (we want to DOUBLE the value of the entire fraction). So, we can ELIMINATE u (A) and x (C) since halving these values in the numerator would make the entire fraction smaller
IMPORTANT: We have 3 answer choices remaining: v, y and z. Since there can be only one correct answer, I can ELIMINATE y and z. Why? Notice that y and z play the same role in the expression ux/(v)(y+z). y and z are each part of the sum y+z. So, it makes not sense that one would be the correct choice and the other would be incorrect. That is, it's impossible that halving one of those variables would end up doubling the entire fraction BUT halving the other variable would not have the same effect. So, we can ELIMINATE y (D) and z (E)
Answer: B
ASIDE: notice what happens when we take ux/(v)(y+z) and replace v with v/2[i.e., halving v] we get: ux/(v/2)(y+z) Simplify to get: 2ux/(v)(y+z) [we've doubled the original value!] _________________
Re: QOTD#25 If the value of the expression above is to be double
[#permalink]
08 Oct 2016, 05:34
Expert Reply
Explanation
Plug in values for the variables, such as u = 2, v = 4, x = 6, y = 8, and z = 10. With these values, the expression equals \(\frac{1}{6}\). . Try halving each of the values to find which one would change the value of the expression to \(\frac{1}{3}\). Halving v to 2 works; the answer is choice B.
_________________
Sandy If you found this post useful, please let me know by pressing the Kudos Button
Re: QOTD#25 If the value of the expression above is to be double
[#permalink]
Updated on: 19 Aug 2019, 14:03
GreenlightTestPrep wrote:
sandy wrote:
\(\frac{u}{v} * \frac{x}{(y+z)}\)
If the value of the expression above is to be doubled by halving exactly one of the five variables, which variable should be halved?
A. u B. v C. x D. y E. z
Combine the two fractions to get ux/(v)(y+z) First notice that, if we make the numerator smaller, the value of the entire fraction will become smaller. (we want to DOUBLE the value of the entire fraction). So, we can ELIMINATE u (A) and x (C) since halving these values in the numerator would make the entire fraction smaller
IMPORTANT: We have 3 answer choices remaining: v, y and z. Since there can be only one correct answer, I can ELIMINATE y and z. Why? Notice that y and z play the same role in the expression ux/(v)(y+z). y and z are each part of the sum y+z. So, it makes not sense that one would be the correct choice and the other would be incorrect. That is, it's impossible that halving one of those variables would end up doubling the entire fraction BUT halving the other variable would not have the same effect. So, we can ELIMINATE y (D) and z (E)
ASIDE: notice what happens when we take ux/(v)(y+z) and replace v with v/2[i.e., halving v] we get: ux/(v/2)(y+z) Simplify to get: 2ux/(v)(y+z) [we've doubled the original value!]
RELATED VIDEO
Thanks!
Originally posted by JNeen on 16 Aug 2019, 13:48.
Last edited by JNeen on 19 Aug 2019, 14:03, edited 1 time in total.
Re: QOTD#25 If the value of the expression above is to be double
[#permalink]
16 Aug 2021, 11:38
Hello from the GRE Prep Club BumpBot!
Thanks to another GRE Prep 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.