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The question is somewhat wrong as it as already given that L and M intersect at 40 degrees.

What is asked to find is not clear
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The question is somewhat wrong as it as already given that L and M intersect at 40 degrees.

What is asked to find is not clear
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Edited. Thank you.
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angle between two sides (Streets) L and M is 40 degree
the angle between the sides (Streets) N and M is 90 degrees
Hence angle between sides (Streets) L and N should be 180-(40+90)=50 degree (Option E)
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Bunuel
Streets L, M and N are straight and level, and they intersect to form a triangle. If streets L and M intersect at a 40° angle and if street N is perpendicular to street M, at what acute angle do streets L and N intersect?

(A) 30°
(B) 35°
(C) 40°
(D) 45°
(E) 50°

\(\angle\) LM = 40
\(\angle\) NM = 90
\(\angle\) LN = 180 - (40+90)
= 50

Answer E
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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