Question

If 2A + 2B = 120°, AND 2B + 2C = 100° AND 2C + 2A = 140° then A + B+ C is
A) 90
(b) 120
(c) 180
(d)220​

Answer 1

a+b  =120/4 =30

b+c=  140/4  =7/2

so atme

ans is opt. a =90