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What is the total number of triangles in the below figure

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BukrsGmat
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What is the total number of triangles in the below figure [#permalink] New post   Updated on: 24 Apr 2013, 01:13
00:00
A
B
C
D
E

Difficulty:

65% (hard)

Question Stats:

55% (02:10) correct 45% (00:42) wrong based on 11 sessions
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What is the total number of triangles in the below figure
Attachment:
Untitled.png

A. 17
B. 20
C. 24
D. 27
E. 52

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Official Answer
D

Originally posted by BukrsGmat on 23 Apr 2013, 23:48.
Last edited by Bunuel on 24 Apr 2013, 01:13, edited 1 time in total.
Edited the question.
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smyarga
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Re: What is the total number of triangles in the below figure [#permalink] New post   24 Apr 2013, 00:34
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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.

The correct answer is D.
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navigator123
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Re: What is the total number of triangles in the below figure [#permalink] New post   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.

The correct answer is D.

Is this a GMAT question?
Also, is there any formula/procedure to solve this question?
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smyarga
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Re: What is the total number of triangles in the below figure [#permalink] New post   24 Apr 2013, 05:56
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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
howmanysquares.png [ 176.67 KiB | Viewed 3412 times ]

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dipen01
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Re: What is the total number of triangles in the below figure [#permalink] New post   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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Re: What is the total number of triangles in the below figure [#permalink] New post   27 Apr 2013, 05:38
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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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Re: What is the total number of triangles in the below figure [#permalink]
27 Apr 2013, 05:38
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