Answer:

AB||CD

<Y=75

<YXD=25+y

<Y=<YXD [corresponding angles]

75=25+y

75-25=y

y=50

<YXD + <X =180 [angle formed on a line]

25+y+ <X =180

25+50+ <X = 180

75+ <X = 180

<X =180 – 75 =105