In the diagram, PQR is a straight line, (m + n) = 120o and (n…

In the diagram, PQR is a straight line, (m + n) = 120^o and (n + r) = 100^o. Find (m + r)

Correct Answer: Option C

Explanation

if m + n = 120^o and n + r = 100^o
then m + n = 120^o
then r = 180^o – 120^o = 60^o
also n + r = 100^o
m = 180^o = 80^o
m + r is = 80^o + 60^o
= 140^o