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

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Math Expert
Joined: 02 Sep 2009
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Lines m and n intersect, as shown in the figure above. What is the val  [#permalink]

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19 Nov 2017, 23:47
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15% (low)

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83% (00:30) correct 17% (00:44) wrong based on 90 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.

Attachment:

1122.jpg [ 4.27 KiB | Viewed 1334 times ]

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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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20 Nov 2017, 00:13
(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
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Lines m and n intersect, as shown in the figure above. What is the val  [#permalink]

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20 Nov 2017, 04:35
Bunuel wrote:

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.

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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20 Nov 2017, 10:03
(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
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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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20 Nov 2017, 20:17
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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20 Nov 2017, 21:07
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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Intern
Joined: 11 Oct 2017
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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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21 Nov 2017, 07:14
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 &nbs [#permalink] 21 Nov 2017, 07:14
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