In the diagram, PQR is a straight line, (m + n) = 120o and (n + r) = 100o. Find (m + r)
Attached Figure / Diagram
A
110o
B
120o
C
140o
D
160o
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
if m + n = 120o and n + r = 100o
then m + n = 120o
then r = 180o - 120o = 60o
also n + r = 100o
m = 180o = 80o
m + r is = 80o + 60o
= 140o
Source: Myschool Past Questions Archive (Record #37004)