Doubt with geometry problem

[david3305]

Homework Statement

Find x. L1 and L2 are parallel

choices:
a)2°40'
b)2°30'
c)2°45'
d)2°15'
e)2°20'

Homework Equations

Σleft∠ = Σright∠

The Attempt at a Solution

2x+1+4x-1+4x-1 = 2x-1+2x+4+3x+2
10x-1=7x+5
3x=6
x=2°

Not sure how the answers include minutes '

Maybe I'm overlooking something?

 

[mfb]

I get the same result. Maybe an error in the book.

 

[david3305]

Yeah, that's what I think too. I'll leave this open just in case anybody has anything to add. Maybe another way of solving?

 

[NascentOxygen]

Quite possibly they made a typo when labelling the figure. You might be able to make a simple change to one of the coefficients or constants in the diagram to have it give their desired answer.

 

[Aufbauwerk 2045]

Is this for real? I've seen other problems with a similar sort of handwriting style, and wrong answers which are said to be from the mysterious "book." So what exactly is the "book?" and why do people post this sort of thing? Sorry if I am too cynical, but I could almost believe this is some kind of joke.

 

[david3305]

Lol. I felt doubt about this because most of the problems i have solved had a correct answer in the choices.