PLEASE HELP HELP ME WITH THIS

Question

Which postulate explains why angle PQR would be 140 degrees in the picture below? 

Group of answer choices

A.interior angles postulate

B.addition postulate

C.sum angle postulate

D. angle addition postulate

Answer 1

< PQR + < RQS = < PQS by the angle addition postulate (D)

We are given <RQS = 20 and <PQS = 160, so substituting those values into the above equation we get:

<PQR + 20 = 160

<PQR = 140