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:

Re: If m > 0, y > 0, and x is m percent of 2y, then, in terms of y, m is [#permalink]

Show Tags

10 Nov 2014, 14:16

1

This post received KUDOS

Bunuel wrote:

Tough and Tricky questions: Sequences.

If m > 0, y > 0, and x is m percent of 2y, then, in terms of y, m is what percent of x?

A. y/200 B. 2y C. 50y D. 50/y E. 5000/y

Kudos for a correct solution.

I did this problem differently than DaVagabond, using some algebraic manipulation as well as properties of fractions and decimals as percentages. My solution is as follows:

For this problem, one needs to know a little about converting to percentages. First, when saying x is m percent of 2y, this means we need to know how to write some number m as a percentage. As percent implies (per one hundred) dividing m by 100 gives us m as a percentage. So we have x is m percent of 2y, or x = (m/100)*2y. This is because when saying x is a certain percentage of another number, you can find x by multiplying the given number by that percentage.

The next property we need to know is how to convert a fraction into a percentage. The problem wants us to find out what percentage m is of x. This value will be equal to (m/x)*100. Whenever finding what percentage some number m is of some number x, one can simply divide m/x and then multiply by 100. For example, when finding what percent 2 is of 3, 2/3 as a percentage, is 200/3, or 66.7%.

Now that we have our equation and our conversion property, we just need to solve.

We need to manipulate x = (m/100)*2y and get a term of (m/x). In doing so we find (m/x) = 50/y. To find (m/x) as a percentage, we just multiply 50/y * 100 which gives us an answer of 5000/y.

Re: If m > 0, y > 0, and x is m percent of 2y, then, in terms of y, m is [#permalink]

Show Tags

10 Nov 2014, 16:08

nachobioteck wrote:

I did this by picking number.

2Y = 100 m =20 therefore x=20

20 = 100% of x therefore the answer is 2Y...

Hopefully this approach is the correct one.

I used a similar approach of picking numbers and have the same answer: 2Y

Picking numbers that make calculating % simple, I choose Y = 50, thus 2Y = 100

Any value for m (such as m=25), therefore, m/2y = x = 25/100 = 25%

And.... to find the solution m/x = 25/25 which is 1 (or 100%). Quickly scanning A through E, I see 2y, which is 2(50) = 100. This matches the value I'm looking for. Final answer: 2y

Re: If m > 0, y > 0, and x is m percent of 2y, then, in terms of y, m is [#permalink]

Show Tags

08 Apr 2017, 20:54

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.
_________________