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If the sum of two angles of a parallelogram is 100°, what is the avera

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Joined: 02 Sep 2009
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If the sum of two angles of a parallelogram is 100°, what is the avera [#permalink]

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28 Sep 2017, 22:50
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If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260
[Reveal] Spoiler: OA

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Posts: 24
Location: India
Concentration: Technology, General Management
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Re: If the sum of two angles of a parallelogram is 100°, what is the avera [#permalink]

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29 Sep 2017, 01:02
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sum of two angles of a parallelogram is 100°
so sum of the other two angle should be (360-100)/2 = 130
So mean should be (130+130)/2 = 130

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Joined: 22 May 2016
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If the sum of two angles of a parallelogram is 100°, what is the avera [#permalink]

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29 Sep 2017, 13:01
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Bunuel wrote:
If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260

The sum of interior angles of a quadrilateral is 360 degrees.

Though we are not sure which two angle measures sum to 100, we are asked only for the average (arithmetic mean) of the other two.

There are (360 - 100) = 260 degrees that remain, and two angles.

$$\frac{260}{2}$$ = 130

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Re: If the sum of two angles of a parallelogram is 100°, what is the avera [#permalink]

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03 Oct 2017, 15:34
Bunuel wrote:
If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260

A parallelogram’s angles always sum to 360 degrees. If the sum of two angles of a parallelogram is 100 degrees, then the remaining 2 angles must sum to 260 degrees, and so the average of those two angles is 260/2 = 130 degrees.

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Re: If the sum of two angles of a parallelogram is 100°, what is the avera   [#permalink] 03 Oct 2017, 15:34
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