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 week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button; 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Re: If 18 is 15 percent of 30 percent of a certain number, what [#permalink]

Show Tags

14 Mar 2014, 11:20

Answer in 30 seconds by just glancing the answers.

As question states the 15% of 30% of x =18.

A)9 . Less than 18. Not an answer. B)36 . 30 % is less than 18. Not an answer . Alternatively 1/3 (close to 30%) is 12 < 18. So not an answer C)40 . 30 % is less than 18. Not an answer . Alternatively 1/3 (close to 30%) is 12 < 18. So not an answer D)81 . 30 % is less than 18. Not an answer . Alternatively 1/3 (close to 30%) is 27 and 1/6 (close to 15%) 4 < 18. So not an answer E)400 . E is answer no need to calculation.

Alternatively solution

Start putting the biggest number and get the result in first try 15% of 30% of 400 =18.

Re: If 18 is 15 percent of 30 percent of a certain number, what [#permalink]

Show Tags

13 Dec 2015, 08:45

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: If 18 is 15 percent of 30 percent of a certain number, what [#permalink]

Show Tags

25 Aug 2017, 07:46

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: If 18 is 15 percent of 30 percent of a certain number, what [#permalink]

Show Tags

25 Aug 2017, 21:19

In the Stem it is asked about 18 = 15 % of 30 % of a number, 15% of a number is 18 means the number should be greater than 100, only answer E having number greater than 100, so answer should be E
_________________

Re: If 18 is 15 percent of 30 percent of a certain number, what [#permalink]

Show Tags

26 Aug 2017, 10:27

nkmungila wrote:

In the Stem it is asked about 18 = 15 % of 30 % of a number, 15% of a number is 18 means the number should be greater than 100, only answer E having number greater than 100, so answer should be E

but you must calculate the answer , if in case the answer choices are above 100 then your method will not work, so my suggestion is although here it is applicable but when there are comparable choices do by actual calculation.
_________________

Give Kudos for correct answer and/or if you like the solution.

Version 8.1 of the WordPress for Android app is now available, with some great enhancements to publishing: background media uploading. Adding images to a post or page? Now...

“Keep your head down, and work hard. Don’t attract any attention. You should be grateful to be here.” Why do we keep quiet? Being an immigrant is a constant...