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You posted this question incorrectly because all of the answers need to be surrounded with a box, or in your notation, an underline. Failing to do this misses the point of the problem.

You posted this question incorrectly because all of the answers need to be surrounded with a box, or in your notation, an underline. Failing to do this misses the point of the problem.

Good spot. I've corrected the answer choices. You're obviously familiar with the problem - care to answer?

For all positive integers m, M=3m when m is odd and M=1/2 when m is even. Which of the following is equivalent to 9 x 6?

A) 81 B) 54 C) 36 D) 27 E) 18

Clear, concise explanations welcome!

It should be D.... Please check...

9 x 6 = (3x9) x (6 x 1/2) = 27 x 3 = 27 _________________

Cheers! JT........... If u like my post..... payback in Kudos!!

|Do not post questions with OA|Please underline your SC questions while posting|Try posting the explanation along with your answer choice| |For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|

You posted this question incorrectly because all of the answers need to be surrounded with a box, or in your notation, an underline. Failing to do this misses the point of the problem.

Good spot. I've corrected the answer choices. You're obviously familiar with the problem - care to answer?

9 = 27 and 6 = 3, multiplied together they = 81.

Because the answer choices are notated with the _, however, you need to calculate the "_" value of 81

easy question and mysterios answer choice, pls help! [#permalink]

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30 Apr 2010, 10:39

It is a question from GMATprep

question itself: For all positive integers m, {m}=3m, when m is odd, and {m}=m/2 when m is even. which of the following is equivalent to {9}*{6} ? a){81} b){54} c){36} d){27} e){18}

my solution: solution seemed to me very easy 9 is odd and 6 is even so ={9*3}*{6/2}=27*3=81

i made the same mistake with the boxes .....gmat is really smart with tricking you with such questions .....one thing that i noticed was that i make a lot of mistakes when converting the algebraic expression so lets say they asked about the product ...i will for some reason start adding in my calculation

We need an eagle eye to crack this type.
_________________

Want to improve your CR: http://gmatclub.com/forum/cr-methods-an-approach-to-find-the-best-answers-93146.html Tricky Quant problems: http://gmatclub.com/forum/50-tricky-questions-92834.html Important Grammer Fundamentals: http://gmatclub.com/forum/key-fundamentals-of-grammer-our-crucial-learnings-on-sc-93659.html

Need help with these 5 GMAT Prep questions... [#permalink]

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08 Dec 2010, 14:51

Guys, as my G-day is approaching, I am putting more and more effort in improving my Quant. However, I seem to have troubles with some basic concepts. Below are the 5 questions which I know have simple explanations but are for some reason difficult for me to understand. If you can explain the solutions for any of them, I would greatly appreciate it! Cheers!

[highlight]Monster collection of Verbal questions (RC, CR, and SC)[/highlight] http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142

[highlight]Massive collection of thousands of Data Sufficiency and Problem Solving questions and answers:[/highlight] http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133

Re: Tough Algebra, Can anyone help me? Thanks!! [#permalink]

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27 Feb 2011, 00:18

IanStewart wrote:

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.

Thanks mate! This one was my big "AHA! Gotcha" GMAT moment for the day. A clever trap!
_________________

-DK --------------------------------------------------------- If you like what you read then give a Kudos! Diagnostic Test: 620 The past is a guidepost, not a hitching post. ---------------------------------------------------------

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