The figure above shows a construction plan for the intersection of three straight roads, each having parallel edges and each having the same width. what is the value of t?
(1) r = 140. Not sufficient.
(2) s = 160. Not sufficient.
(1)+(2) Consider the width of the roads to be 0 as shown below:
From the figure we have that r+s+t=360 degrees --> 140+160+t=360 --> t=60 degrees. Sufficient.
I have small doubt here
Suppose the length is not 0 then you will have two variables and you cannot solve the equation i.e the equation becomes
Then T= 360-3X-R-S
and here you have 2 variables and 1 equation you cannot get a single solution
Am i right?
No you are not. The edges of the road are parallel, so there is 0 degree angle between them.