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ANSWER
In △ABC,
Sum of all angles equals to 180
o
Hence,
2x+3x+4x=180
∴x=20
o
Since, CD is parallel to AB,
∴m∠BAC=m∠ACD
∴m∠BAC=m∠ACD=40
o
Also, m∠ACB+m∠ACD+y
o
=180
o
i.e., 80+40+y=180
∴y
o
=60
o
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