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:

9 is odd: [9] = 3*9 = 27 6 is even: [6] = (1/2)*6 = 3

Hence [9] x [6] = 27 x 3 = 81 Ans: A

My bad. The answers should have been worded as follows (which makes a difference).

A. [81]

B. [54]

C. [36]

D. [27]

E. [18]

When the answers are reworded, the correct answer is D, or [27]. It looks like GMAC was tricky with this question and some readers didn't notice the answers were surrounded by a box. Fortunately, I was lucky enough to find a thread that discusses this:

For all positive integers m,[m]=3m when m is odd and [m]=1/2m when m is even.which of the following is equivalent to [9]*[6]? A)[81] B)[54] C)[36] D)[27] E)[18]

Re: Quant question [#permalink]
07 Oct 2009, 13:43

yogitapruthi wrote:

For all positive integers m,[m]=3m when m is odd and [m]=1/2m when m is even.which of the following is equivalent to [9]*[6]? A)[81] B)[54] C)[36] D)[27] E)[18]

can anybody answer this with explanation.

Thanks

[9] = 3 x 9 = 27 [6] = 6/2 = 3

so [9].[6]= 27 x 3 = [27] (as 27 is odd) _________________

Funny, I came across this questions today as well and I answered it the same way. It's not that 81 is wrong, it's that we chose the wrong answer. I think the asterisk represents a box, right? All of the answer choices were boxed, therefore we're still supposed to follow the rules mentioned in the question. 27* is right because 27 multiplied by 3 (the rule for odd integers) is 81.

The asterisk is a box! But I couldn't copy and paste so I had to come up with something Oh God, now I got it. You're soo right! I completely ignored the fact that the answers were in the box too. My bad. Thanks a lot! Did you look at my other post too? I have a feeling I'm ignoring something obvious in that one too! Thanks again!

hi guys, I can't figure out why I can't get this question right, appreciate all comments in advance.

Q: For all positive integers m, [m]=3m when m is odd and [m]=1/2 m when m is even. What is [9] x [6] equivalent to?

1) [81] 2) [18] 3) [27] 4) [54] 5) [36]

now my answer was 81 but the right answer according to Official GMAT is 27 and I can't seem to understand why! please help me out here.

Because [m] = 3m when m is odd, [9]=3m, m=3. Using the same logic for [6], [6]=3 3*3=9 If you put this back in [m] form you get 3*9=[27] (we must use 3m because m is odd, if it were even it would be .5*9) Thus answer choice C

Thanks for the help. It's from GMAT Prep, my answer is 81, but OA is 27. Anyone knows how to get the right answer? Thank you so much again for the great help and time!!

Re: Tough Algebra, Can anyone help me? Thanks!! [#permalink]
08 Feb 2010, 14:52

1

This post received KUDOS

Expert's post

We know that [9] = 3*9 = 27, since [x] = 3x when x is odd. We also know that [6] = 3, since [x] = x/2 when x is even. So [9]*[6] = 27*3 = 81.

Now, many people choose the wrong answer to this question, despite doing all of the work correctly, because they do not notice that the answer choices are all in boxes - a devious GMAT trap. So the answer choice which reads [81] is not equal to the number 81; it is equal to 3*81 = 243, because [x] = 3x when x is odd. The correct answer here is [27], which is equal to the number 81. _________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Low GPA MBA Acceptance Rate Analysis Many applicants worry about applying to business school if they have a low GPA. I analyzed the low GPA MBA acceptance rate at...

UNC MBA Acceptance Rate Analysis Kenan-Flagler is University of North Carolina’s business school. UNC has five programs including a full-time MBA, various executive MBAs and an online MBA...

To hop from speaker to speaker, to debate, to drink, to dinner, to a show in one night would not be possible in most places, according to MBA blogger...

Most top business schools breed their students for a career in consulting or financial services (which is slowly being displaced by high tech and entrepreneurial opportunities). Entry into...