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What is the total number of triangles in the below figure

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Manager
Joined: 27 Jul 2011
Posts: 183

Kudos [?]: 287 [0], given: 103

What is the total number of triangles in the below figure [#permalink]

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23 Apr 2013, 23:48
00:00

Difficulty:

45% (medium)

Question Stats:

64% (01:05) correct 36% (00:27) wrong based on 22 sessions

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What is the total number of triangles in the below figure
Attachment:

Untitled.png [ 130.7 KiB | Viewed 1580 times ]

A. 17
B. 20
C. 24
D. 27
E. 52
[Reveal] Spoiler: OA

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Last edited by Bunuel on 24 Apr 2013, 01:13, edited 1 time in total.
Edited the question.

Kudos [?]: 287 [0], given: 103

Tutor
Joined: 20 Apr 2012
Posts: 100

Kudos [?]: 327 [1], given: 36

Location: Ukraine
GMAT 1: 690 Q51 V31
GMAT 2: 730 Q51 V38
WE: Education (Education)
Re: what is the total number of triangles in the below fig [#permalink]

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24 Apr 2013, 00:34
1
KUDOS
There are 1 the largest triangle formed by 16 small triangles. Total 17 triangles. There are triangles formed by 4 small triangles: 7 such triangles. And there are tiangles formed by 9 small triangles: 3 such triangles.
Total 17+7+3=27.

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I'm happy, if I make math for you slightly clearer
And yes, I like kudos:)

Kudos [?]: 327 [1], given: 36

Manager
Status: Trying.... & desperate for success.
Joined: 17 May 2012
Posts: 73

Kudos [?]: 106 [0], given: 61

Location: India
Schools: NUS '15
GPA: 2.92
WE: Analyst (Computer Software)
Re: what is the total number of triangles in the below fig [#permalink]

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24 Apr 2013, 01:26
smyarga wrote:
There are 1 the largest triangle formed by 16 small triangles. Total 17 triangles. There are triangles formed by 4 small triangles: 7 such triangles. And there are tiangles formed by 9 small triangles: 3 such triangles.
Total 17+7+3=27.

Is this a GMAT question?
Also, is there any formula/procedure to solve this question?

Kudos [?]: 106 [0], given: 61

Tutor
Joined: 20 Apr 2012
Posts: 100

Kudos [?]: 327 [0], given: 36

Location: Ukraine
GMAT 1: 690 Q51 V31
GMAT 2: 730 Q51 V38
WE: Education (Education)
Re: What is the total number of triangles in the below figure [#permalink]

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24 Apr 2013, 05:56
I don't see any problem with this task to be not a GMAT question. I think it is more than possible to solve it in 2 minutes. I don't know any formula for this problem, just the logic. If we talk about procedure I can only suggest that you should go from the smallest triangles to the largest. I attach similar problem
Attachments

File comment: Just similar problem

howmanysquares.png [ 176.67 KiB | Viewed 1479 times ]

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I'm happy, if I make math for you slightly clearer
And yes, I like kudos:)

Kudos [?]: 327 [0], given: 36

Intern
Joined: 19 Dec 2012
Posts: 26

Kudos [?]: 11 [0], given: 8

Location: India
GPA: 3.75
WE: Supply Chain Management (Consumer Products)
Re: What is the total number of triangles in the below figure [#permalink]

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24 Apr 2013, 11:30
I doubt of these kind of questions are used by GMAC.

Anyways, in my opinion, questions like these require more of patience than time.

Size - No of Squares
4 - 1
3 - 4
2 - 9
1 - 18
0.5 - 8

Total - 40
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Kudos Please... If my post helped.

Kudos [?]: 11 [0], given: 8

Math Expert
Joined: 02 Sep 2009
Posts: 41885

Kudos [?]: 128725 [0], given: 12182

Re: What is the total number of triangles in the below figure [#permalink]

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27 Apr 2013, 05:38
smyarga wrote:
I don't see any problem with this task to be not a GMAT question. I think it is more than possible to solve it in 2 minutes. I don't know any formula for this problem, just the logic. If we talk about procedure I can only suggest that you should go from the smallest triangles to the largest. I attach similar problem

I don't think that this or the question from original post are GMAT type.
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Kudos [?]: 128725 [0], given: 12182

Re: What is the total number of triangles in the below figure   [#permalink] 27 Apr 2013, 05:38
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