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Lines m and n intersect, as shown in the figure above. What is the val

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Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 19 Nov 2017, 22:47
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A
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D
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89% (00:15) correct 11% (00:21) wrong based on 44 sessions

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Lines m and n intersect, as shown in the figure above. What is the value of u - w?

(1) u = 90

(2) Lines m and n are perpendicular.


[Reveal] Spoiler:
Attachment:
1122.jpg
1122.jpg [ 4.27 KiB | Viewed 493 times ]
[Reveal] Spoiler: OA

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Re: Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 19 Nov 2017, 23:13
(1) If u = 90 it follows that w = 90, so the u-w=0
(2) Again, here we can deduce that u=w=90, thus u-w=0
Answer D

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Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 20 Nov 2017, 03:35
Bunuel wrote:
Image
Lines m and n intersect, as shown in the figure above. What is the value of u - w?

(1) u = 90

(2) Lines m and n are perpendicular.


[Reveal] Spoiler:
Attachment:
1122.jpg

D

u+w = 180
1) u = 90 so w =90
u-w = 0 Suff
2) perpendicular - at an angle of 90 u=w, u-w = 0 Suff
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Re: Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 20 Nov 2017, 09:03
(1) If u = 90, u & w forms linear pair, this means w = 90, so the u-w=0
(2) Again, perpendicular means 90, u=w=90, thus u-w=0
Answer D
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Re: Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 20 Nov 2017, 19:17
I'm 99.9999% sure that the answer is B.

Statement 1) just says the value of one angle, you can't assume the value of the other.
Not Suff.
Statement 2) Makes clear reference to the relation of both values.
Suff.

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Re: Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 20 Nov 2017, 20:07
PaterD wrote:
I'm 99.9999% sure that the answer is B.

Statement 1) just says the value of one angle, you can't assume the value of the other.
Not Suff.
Statement 2) Makes clear reference to the relation of both values.
Suff.

Hi Peter,

You mean to say that u + w = 180 is wrong as per the given figure??

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Re: Lines m and n intersect, as shown in the figure above. What is the val [#permalink]

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New post 21 Nov 2017, 06:14
Hi Peter,

You mean to say that u + w = 180 is wrong as per the given figure??

Sent from my Lenovo P1a42 using GMAT Club Forum mobile app[/quote]

:dazed Don't know what happended to me... must have been tired.

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Re: Lines m and n intersect, as shown in the figure above. What is the val   [#permalink] 21 Nov 2017, 06:14
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Lines m and n intersect, as shown in the figure above. What is the val

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