Help needed - i dont understand why d is the wright answer. - The Beat The GMAT Forum

Help needed - i dont understand why d is the wright answer.

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kipkipod: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Wed May 18, 2011 5:34 am

by kipkipod » Wed May 18, 2011 5:37 am

thank you

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Source: Beat The GMAT — Problem Solving | Wed May 18, 2011 5:37 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Wed May 18, 2011 5:51 am

kipkipod wrote:
thank you

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

Therefore, square [9] * square [6] = 27 * 3, note here 27 is odd so it is equal to square [27], by definition of [m] when m is odd.

The correct answer is D.

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kipkipod: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Wed May 18, 2011 5:34 am

by kipkipod » Wed May 18, 2011 5:58 am

thank you, i have realized that i ignored the fact that the options are in squares also...

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Wed May 18, 2011 5:59 am

kipkipod wrote:thank you, i have realized that i ignored the fact that the options are in squares also...

yes that's right.

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MI3: Senior | Next Rank: 100 Posts; Posts: 83; Joined: Sat Feb 26, 2011 11:22 amFollowed by: 1 member; Thanked: 1 times

by MI3 » Sat Jun 18, 2011 1:40 am

Hello Anurag,

Am sorry, but I don't follow the 'square' concept and don't get why the answer is not 81, would you mind breaking the explanation down further please?

Thank you,
M

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MBA.Aspirant: Master | Next Rank: 500 Posts; Posts: 401; Joined: Tue May 24, 2011 1:14 amFollowed by: 5 members; Thanked: 37 times

by MBA.Aspirant » Sat Jun 18, 2011 2:48 am

kipkipod wrote:
thank you

Since 9 is odd, square 9 = 3 *9 = 27

Since 6 is even, square 6 = 1/2 *6 = 3

so square 9 x square 6 = 27 x 3 = 81

since he's putting the answers in squares u gotta look for the answer equivalent to 81.

square 27 = 27 *3 = 81 <= Bingo!

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stuffstuff: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Tue May 24, 2011 10:44 am; Thanked: 2 times

by stuffstuff » Sat Jun 18, 2011 7:45 am

162 is also an acceptable answer, is it not? (although irrelevent since it wasn't an option)

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edvhou812: Master | Next Rank: 500 Posts; Posts: 143; Joined: Sat Nov 06, 2010 9:06 pmFollowed by: 1 member; Thanked: 10 times

by edvhou812 » Sat Jun 18, 2011 4:40 pm

I'm not getting why the answer is not 81 either.

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