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odd/even question

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Manager
Joined: 01 May 2008
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Location: São Paulo
odd/even question [#permalink]

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04 May 2008, 13:51
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

At the GMAC Practice test, the answer of this question is 27, but I don't understand why (I think it is 81).
Can anyony explain why it is 27?
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Kudos [?]: 7 [0], given: 0

VP
Joined: 10 Jun 2007
Posts: 1434

Kudos [?]: 350 [0], given: 0

Re: odd/even question [#permalink]

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04 May 2008, 14:51
ldpedroso wrote:
At the GMAC Practice test, the answer of this question is 27, but I don't understand why (I think it is 81).
Can anyony explain why it is 27?

Even though [9] * [6] = 81, the question is looking for [x] = 81
[27] = 3*27 = 81

Kudos [?]: 350 [0], given: 0

Manager
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Posts: 111

Kudos [?]: 7 [0], given: 0

Location: São Paulo
Re: odd/even question [#permalink]

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04 May 2008, 15:14
Sorry, but I didn't understand the explanation

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VP
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Re: odd/even question [#permalink]

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04 May 2008, 15:21
ldpedroso wrote:
Sorry, but I didn't understand the explanation

Look at the answer choices carefully. They are in form of [X] not X.
You got the 81 part correct because [9]*[6] = 81

But the answer choices is NOT 81 because [81] != 81

[27] = 3*27 = 81

Kudos [?]: 350 [0], given: 0

Manager
Joined: 01 May 2008
Posts: 111

Kudos [?]: 7 [0], given: 0

Location: São Paulo
Re: odd/even question [#permalink]

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04 May 2008, 15:53
Ah! Ok! THANKS
How dumb I am....

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VP
Joined: 10 Jun 2007
Posts: 1434

Kudos [?]: 350 [0], given: 0

Re: odd/even question [#permalink]

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04 May 2008, 17:22
ldpedroso wrote:
Ah! Ok! THANKS
How dumb I am....

I am sure a lot of people would fall for the trap under pressure. Just be careful...

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Re: odd/even question   [#permalink] 04 May 2008, 17:22
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