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taneja.niks: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Tue Jun 29, 2010 9:41 am; Thanked: 2 times

by taneja.niks » Sun Jul 25, 2010 12:22 am

For al positive integers m, m=3m when mis odd and m=1/2m when m is even which of the following is equvalent to 9*6

81
54
36
27
18

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Source: Beat The GMAT — Problem Solving | Sun Jul 25, 2010 12:22 am

selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Sun Jul 25, 2010 12:25 am

m=3m,when m is odd

m=1/2m,when m is even

9*6

m=9 is odd,m=27

m=6 is even,m=3

27*3=81

Pick A

--Anand--

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taneja.niks: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Tue Jun 29, 2010 9:41 am; Thanked: 2 times

by taneja.niks » Sun Jul 25, 2010 12:29 am

yeah buddy i got the same one........ but the answer according to the gmat prep........ is 27

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Sun Jul 25, 2010 12:33 am

taneja,

I think something is missing in the question.Can u pl check it again?

--Anand--

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taneja.niks: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Tue Jun 29, 2010 9:41 am; Thanked: 2 times

by taneja.niks » Sun Jul 25, 2010 12:37 am

nope buddy the question is exactly same the same thing baffled me as this was my first question in the practice test... and i ws sure i made the right answer....

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Sun Jul 25, 2010 12:37 am

I remember this question.There must be one symbol like []

[m]=3m,when m is odd

[m]=1/2m,when m is even

[9]=27

[6]=3

[9]*[6]=81

81 is expressed by[27] (since 27 is odd [27]=81)

Pick D

This is the question in GMATPREP ?rt?

--Anand--

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taneja.niks: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Tue Jun 29, 2010 9:41 am; Thanked: 2 times

by taneja.niks » Sun Jul 25, 2010 12:43 am

Yes u r right buddy one from GMAT prpe only.......... thts relly tricky..

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Sun Jul 25, 2010 1:05 am

Dude..u missed the symbol in the question..tats why it leads to diff answer..

--Anand--

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getso: Master | Next Rank: 500 Posts; Posts: 141; Joined: Sat Feb 28, 2009 8:19 am; Thanked: 1 times

by getso » Tue Jul 27, 2010 9:49 am

selango wrote:I remember this question.There must be one symbol like []

[m]=3m,when m is odd

[m]=1/2m,when m is even

[9]=27

[6]=3

[9]*[6]=81

81 is expressed by[27] (since 27 is odd [27]=81)

Pick D

This is the question in GMATPREP ?rt?

I didn't get the last step i.e how 81 is expressed as 27.

Could you please explain??

Thanks,
Shobha

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selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Tue Jul 27, 2010 10:19 am

Because the answer options are expressed as symbol[]

[9]*[6]=81

81 is odd..How to express 81 in symbol [] form?

[m]=3m,when m is odd

[m]=81

[m]=3*27

-->m=27

[27]

Hope this clarify..

--Anand--

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saurabhmahajan: Master | Next Rank: 500 Posts; Posts: 250; Joined: Thu Jan 07, 2010 2:21 am; Thanked: 10 times

by saurabhmahajan » Wed Jul 28, 2010 5:03 am

Friends can it be this way ?
9*6 =54
so m is even and therefore m/2.
therefore 54/2= 27

Thanks and regards,
Saurabh Mahajan

I can understand you not winning,but i will not forgive you for not trying.

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rahul goyal: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Thu Aug 05, 2010 3:44 am

by rahul goyal » Mon Aug 09, 2010 12:48 am

selango wrote:m=3m,when m is odd

m=1/2m,when m is even

9*6

m=9 is odd,m=27

m=6 is even,m=3

27*3=81

Pick A

Thanks. Easy way to solve the problem.

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Taran: Senior | Next Rank: 100 Posts; Posts: 57; Joined: Fri Oct 01, 2010 7:34 am; Location: Pune, India; Thanked: 1 times; GMAT Score:680

by Taran » Wed Oct 19, 2011 10:24 pm

This is how i solved it. m can be either odd or even but not both at the same time.

Lets take m=odd. So in 9 x 6, m is 9. Therefore 9x3=27 and 27x6=162. Since 162 is not a given answer, m cannot be odd and therefore must be even (m is a positive integer).

If m is even, then in 9x6, m is 6. so 1/2 x 6 = 3 and 9 x 3 = 27. 27 also exist in our answer options.

Therefore, answer is 27 or D.

**** GIVE KUDOS INCASE YOU LIKED THE EXPLANATION **********

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sl750: Master | Next Rank: 500 Posts; Posts: 496; Joined: Tue Jun 07, 2011 5:34 amFollowed by: 1 member; Thanked: 38 times

by sl750 » Fri Oct 21, 2011 10:44 am

Both the question and the answer have been wrongly transcribed. The original poster seemed pretty confident he/she had it transcribed correctly

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