Question

how to do the 30th question?

Answer 1

A = 50 + 30 = 80⁰ .

in ACB ,

x = 180 - ( 50 + 50 )

x = 80 .

in ACD ,

z = 180 - ( 50 + 80 )

z = 50 .

x + y = 180

y = 180 - 80

y = 100 .