rahul16singh28 wrote:

Please give Kudos, if it helps you in Preparing for GMAT.

An immediate observation...

16x is an angle, so 16x<180.... x<12

Only 8 and 10 are possible..

x=10 can be found from 2nd line and 5th line.

B

Let's check all..

Let number lines 1, 2,3,4,5 from left..

1) let's see 1 PARALLEL to others.

1 ll 2.... x+2x=180...x=60... Not given

1 ll 3.....x=4x....not possible

1 ll 4....x+8x=180...x=20..E

1 ll 5...x=16x...not possible

2) 2

2 ll 3...2x+4x=180...x=30.. not given

2 ll 4 ...2x=8x...not possible

2 ll 5 ...2x+16x=180..x=10..B

3) 3rd

3 ll 4..4x+8x=180....x=15..C

3 ll 5...4x=16x ...not possible

4) 4th

4 ll 5..16x+8x=180... Not possible as X will not be an integer

So possible values of x are 10,15 and 20

But possible is only 10.

How did you know that 16x is an angle, so 16x<180.... x<12