Question

L || m
If m∠1=125 and m∠7=50 then m∠5=

5
55
75
105

Answer 1

angle(1) = 125

angle(2)= 180-125=55

The answer is 55 and i'm just confirming the first answer

Answer 2

angle(1) = 125°
angle(2)= 180°-125°=55° ( supplementary angle)

It is given that l || m, therefore:
angle(2)= angle(5). (Alternate interior angle)
angle(5)= 55°