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# In the spiderweb above, 18 straight threads meet at the center. What

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Math Expert
Joined: 02 Sep 2009
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In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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01 Aug 2017, 04:46
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Question Stats:

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In the spiderweb above, 18 straight threads meet at the center. What is the average (arithmetic mean) measure, in degrees, of the 18 nonoverlapping angles about the center?

(A) 18
(B) 20
(C) 22
(D) 25
(E) 28

[Reveal] Spoiler:
Attachment:

2017-08-01_1349.png [ 55.44 KiB | Viewed 752 times ]
[Reveal] Spoiler: OA

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Re: In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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01 Aug 2017, 04:52
Angle across a point is 360 degree.

Since, there are 18 straight threads that meet at the center,
the average of the 18 non-overlapping angles at the center
is given by $$\frac{360}{18} = 20(Option B)$$
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Target Test Prep Representative
Affiliations: Target Test Prep
Joined: 04 Mar 2011
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Re: In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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02 Aug 2017, 13:37
Bunuel wrote:

In the spiderweb above, 18 straight threads meet at the center. What is the average (arithmetic mean) measure, in degrees, of the 18 nonoverlapping angles about the center?

(A) 18
(B) 20
(C) 22
(D) 25
(E) 28

[Reveal] Spoiler:
Attachment:
2017-08-01_1349.png

We see that 18 angles make up a circle or 360 degrees. Thus, the average of each angle is 360/18 = 20 degrees.

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Jeffery Miller

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Kudos [?]: 752 [0], given: 5

Manager
Joined: 22 May 2017
Posts: 51

Kudos [?]: 4 [0], given: 157

GMAT 1: 580 Q41 V29
GMAT 2: 580 Q43 V27
Re: In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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04 Aug 2017, 16:04
Nice, confusing and easy question.

Sent from my Redmi Note 3 using GMAT Club Forum mobile app

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Senior Manager
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Location: India
Concentration: General Management, Entrepreneurship
GPA: 3.8
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Re: In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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05 Aug 2017, 00:33
Bunuel wrote:

In the spiderweb above, 18 straight threads meet at the center. What is the average (arithmetic mean) measure, in degrees, of the 18 nonoverlapping angles about the center?

(A) 18
(B) 20
(C) 22
(D) 25
(E) 28

[Reveal] Spoiler:
Attachment:
2017-08-01_1349.png

18 straight threads make a total of 360 degree angle.
Average = 360/18 = 20 ..

At first question looks a bit confusing but it is relatively easy problem...

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Manager
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Re: In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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05 Aug 2017, 05:41
there are only 18 angles?

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Manager
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Re: In the spiderweb above, 18 straight threads meet at the center. What [#permalink]

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05 Aug 2017, 20:06
1
KUDOS
pclawong wrote:
there are only 18 angles?

yes there are 18 angles only. you can count it. or see my solution above

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Re: In the spiderweb above, 18 straight threads meet at the center. What   [#permalink] 05 Aug 2017, 20:06
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